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Inital Release:          OTP 26.0
Git Tag:                 OTP-26.0
Date:                    2023-03-22
Trouble Report Id:       OTP-14835, OTP-15597, OTP-15903, OTP-16607,
                         OTP-17771, OTP-17932, OTP-18016, OTP-18029,
                         OTP-18053, OTP-18126, OTP-18131, OTP-18135,
                         OTP-18137, OTP-18140, OTP-18141, OTP-18150,
                         OTP-18159, OTP-18167, OTP-18168, OTP-18176,
                         OTP-18185, OTP-18188, OTP-18204, OTP-18206,
                         OTP-18209, OTP-18210, OTP-18211, OTP-18221,
                         OTP-18225, OTP-18226, OTP-18227, OTP-18228,
                         OTP-18230, OTP-18231, OTP-18235, OTP-18236,
                         OTP-18237, OTP-18238, OTP-18246, OTP-18247,
                         OTP-18248, OTP-18253, OTP-18254, OTP-18259,
                         OTP-18261, OTP-18271, OTP-18272, OTP-18274,
                         OTP-18275, OTP-18276, OTP-18277, OTP-18278,
                         OTP-18279, OTP-18282, OTP-18285, OTP-18286,
                         OTP-18287, OTP-18297, OTP-18300, OTP-18301,
                         OTP-18303, OTP-18305, OTP-18309, OTP-18310,
                         OTP-18312, OTP-18318, OTP-18327, OTP-18334,
                         OTP-18335, OTP-18337, OTP-18338, OTP-18340,
                         OTP-18342, OTP-18344, OTP-18350, OTP-18354,
                         OTP-18355, OTP-18359, OTP-18360, OTP-18361,
                         OTP-18364, OTP-18367, OTP-18369, OTP-18377,
                         OTP-18385, OTP-18389, OTP-18405, OTP-18410,
                         OTP-18413, OTP-18414, OTP-18419, OTP-18423,
                         OTP-18424, OTP-18425, OTP-18430, OTP-18431,
                         OTP-18435, OTP-18438, OTP-18439, OTP-18440,
                         OTP-18441, OTP-18442, OTP-18444, OTP-18445,
                         OTP-18447, OTP-18448, OTP-18451, OTP-18452,
                         OTP-18453, OTP-18455, OTP-18456, OTP-18459,
                         OTP-18466, OTP-18471, OTP-18474, OTP-18476,
                         OTP-18477, OTP-18483, OTP-18484, OTP-18485,
                         OTP-18486, OTP-18487, OTP-18488, OTP-18490,
                         OTP-18491, OTP-18492, OTP-18493, OTP-18494,
                         OTP-18495, OTP-18498, OTP-18499, OTP-18500,
                         OTP-18501, OTP-18502, OTP-18505, OTP-18510,
                         OTP-18511, OTP-18515, OTP-18517, OTP-18518,
                         OTP-18520, OTP-18521, OTP-18522, OTP-18523,
                         OTP-18524
Seq num:                 GH-3150, GH-3390, GH-4225, GH-4343, GH-4965,
                         GH-5325, GH-5333, GH-5639, GH-5695, GH-5877,
                         GH-5889, GH-5899, GH-6014, GH-6085, GH-6098,
                         GH-6117, GH-6132, GH-6139, GH-6156, GH-6221,
                         GH-6333, GH-6339, GH-6348, GH-6380, GH-6455,
                         GH-6461, GH-6477, GH-6508, GH-6544, GH-6606,
                         GH-6672, GH-6679, GH-6706, GH-6850, GH-6942,
                         GH-6990, GH-7015
System:                  OTP
Release:                 26
Application:             asn1-5.1, common_test-1.25, compiler-8.3,
                         crypto-5.2, dialyzer-5.1, diameter-2.3,
                         erl_docgen-1.5, erl_interface-5.4, erts-14.0,
                         ftp-1.1.5, inets-8.4, jinterface-1.14,
                         kernel-9.0, mnesia-4.22, observer-2.15,
                         os_mon-2.9, parsetools-2.5, public_key-1.14,
                         reltool-1.0, runtime_tools-1.20, sasl-4.2.1,
                         snmp-5.14, ssh-5.0, ssl-11.0, stdlib-5.0,
                         syntax_tools-3.1, tftp-1.1, tools-3.6, wx-2.3
Predecessor:             OTP

 Check out the git tag OTP-26.0, and build a full OTP system including
 documentation.

 ---------------------------------------------------------------------
 --- HIGHLIGHTS ------------------------------------------------------
 ---------------------------------------------------------------------

  OTP-14835    Application(s): kernel, stdlib
               Related Id(s): PR-5924

               The Erlang shell has been improved to support the
               following features:

               -- Auto-complete variables, record names, record field
               names, map keys, function parameter types and
               filenames.

               -- Open external editor in the shell (with C-o) to edit
               the current expression in an editor.

               -- Support defining records (with types), functions and
               function typespecs, and custom types in the shell.

               -- Do not save pager commands, and input to io:getline
               in history.


  OTP-17932    Application(s): erts, kernel, stdlib
               Related Id(s): GH-3150, GH-3390, GH-4225, GH-4343,
               PR-6144

               The TTY/terminal subsystem has been rewritten from by
               moving more code to Erlang from the old linked-in
               driver and implementing all the I/O primitives needed
               in a NIF instead.

               On Unix platforms the user should not notice a lot of
               difference, besides better handling of unicode
               characters and fixing of some long standing bugs.

               Windows users will notice that erl.exe has the same
               functionality as a normal Unix shell and that werl.exe
               has been removed and replaced with a symlink to
               erl.exe. This makes the Windows Erlang terminal
               experience identical to that of Unix.

               The re-write brings with it a number of bug fixes and
               feature additions:

               -- The TTY is now reset when Erlang exits, fixing zsh
               to not break when terminating an Erlang session.

               -- standard_error now uses the same unicode mode as
               standard_io.

               -- Hitting backspace when searching the shell history
               with an empty search string no longer breaks the shell.

               -- Tab expansion now works on remote nodes started
               using the JCL interface.

               -- It is now possible to configure the shell slogan and
               the session slogans (that is the texts that appear when
               you start an Erlang shell). See the kernel
               documentation for more details.

               -- Added shell:start_interactive for starting the
               interactive shell from a non-interactive Erlang session
               (for example an escript).

               -- On Windows, when starting in detached mode the
               standard handler are now set to nul devices instead of
               being unset.


  OTP-18135    Application(s): erts
               Related Id(s): GH-4965, PR-6046

               *** POTENTIAL INCOMPATIBILITY ***

               As announced when OTP 25 was released, multi time warp
               mode is now enabled by default. This assumes that all
               code executing on the system is time warp safe.

               If you have old code in the system that is not time
               warp safe, you now explicitly need to start the system
               in no time warp mode (or singe time warp mode if it is
               partially time warp safe) in order to avoid problems.
               When starting the system in no time warp mode, the
               system behaves as it did prior to the introduction of
               the extended time functionality introduced in OTP 18.

               If you have code that is not time warp safe, you are
               strongly encouraged to change this so that you can use
               multi time warp mode. Compared to no time warp mode,
               multi time warp mode improves scalability and
               performance as well as accuracy and precision of time
               measurements.


  OTP-18137    Application(s): compiler, erts
               Related Id(s): PR-6259, PR-6404, PR-6576, PR-6804

               There are several new optimization for binary syntax in
               the JIT:

               -- Creation and matching of binaries with segments of
               fixed sizes have been optimized.

               -- Creation and matching of UTF-8 segments have been
               optimized.

               -- Appending to binaries has been optimized.


  OTP-18185    Application(s): compiler, erts
               Related Id(s): GH-6139

               The compiler and JIT now generate better code for
               creation of small maps where all keys are literals
               known at compile time.


  OTP-18188    Application(s): dialyzer
               Related Id(s): PR-5997

               Dialyzer has a new incremental mode that be invoked by
               giving the --incremental option when running Dialyzer.
               This new incremental mode is likely to become the
               default in a future release.

               Incremental mode primarily differs from the previous,
               "classic", ways of running Dialyzer, in that its model
               is optimised around the common use case of regularly
               analysing a single codebase, tweaking the code,
               analysing it again, and so on, without explicit
               reference to the building and checking of a PLT.

               In this mode the PLT file acts much more like a true
               cache, where users provide a codebase and a set of
               files they care about, and Dialyzer does the legwork in
               terms of deciding how to most efficiently report all of
               the relevant warnings given the cached results it may
               already have in the PLT (and if a PLT doesn't exist,
               incremental mode will create one).


  OTP-18228    Application(s): stdlib
               Related Id(s): GH-5639

               The performance of the base64 module has been
               significantly improved. For example, on an x86_64
               system with the JIT both encode and decode are almost
               three times faster than in Erlang/OTP 25.


  OTP-18235    Application(s): kernel, ssl
               Related Id(s): PR-5840, PR-6104

               Support for Kernel TLS (kTLS), has been added to the
               SSL application, for TLS distribution (-proto_dist
               inet_tls), the SSL option {ktls, true}. Using this for
               general SSL sockets is uncomfortable, undocumented and
               not recommended since it requires very platform
               dependent raw options.

               This, for now, only works for some not too old Linux
               distributions. Roughly, a kernel 5.2.0 or later with
               support for UserLand Protocols and the kernel module
               tls is required.


  OTP-18278    Application(s): kernel, stdlib
               Related Id(s): PR-6260

               The Erlang shell's auto-completion when typing tab has
               been changed to happen after the editing current line
               instead of before it.

               This behaviour can be configured using a the
               shell_expand_location STDLIB configuration parameter.


  OTP-18297    Application(s): compiler, stdlib
               Related Id(s): GH-6348

               A limitation in the binary syntax has been removed. It
               is now possible to match binary patterns in parallel.
               Example: <<A:8>> = <<B:4,C:4>> = Bin


  OTP-18318    Application(s): stdlib
               Related Id(s): PR-6347

               In the lists, the zip family of functions now takes
               options to allow handling lists of different lengths.


  OTP-18334    Application(s): erts
               Related Id(s): PR-6434

               Support for UTF-8 atoms and strings in the NIF
               interface including new functions enif_make_new_atom,
               enif_make_new_atom_len and enif_get_string_length.


  OTP-18367    Application(s): compiler, erts, stdlib
               Related Id(s): GH-6544

               The BIFs min/2 and max/2 are now allowed to be used in
               guards and match specs.


  OTP-18413    Application(s): compiler, erts, stdlib, syntax_tools,
               tools
               Related Id(s): EEP-58, PR-6727

               Map comprehensions as suggested in EEP 58 has now been
               implemented.


  OTP-18414    Application(s): erts, stdlib
               Related Id(s): PR-6151

               Some map operations have been optimized by changing the
               internal sort order of atom keys. This changes the
               (undocumented) order of how atom keys in small maps are
               printed and returned by maps:to_list/1 and maps:next/1.
               The new order is unpredictable and may change between
               different invocations of the Erlang VM.

               For applications where order is important, there is a
               new function maps:iterator/2 for creating iterators
               that return the map elements in a deterministic order.
               There are also new modifiers k and K for the format
               string for io:format() to support printing map elements
               ordered.


  OTP-18431    Application(s): compiler, stdlib
               Related Id(s): PR-6739

               Improved the selective receive optimization, which can
               now be enabled for references returned from other
               functions.

               This greatly improves the performance of
               gen_server:send_request/3, gen_server:wait_response/2,
               and similar functions.


  OTP-18435    Application(s): erts
               Related Id(s): PR-6827

               The amount of significant bits in node local process
               identifiers and port identifiers has been extended from
               28 bits to 60 bits on 64-bit runtime systems. This
               makes these identifiers large enough to in practice
               never having to be reused during the life time of a
               node.


  OTP-18440    Application(s): erts
               Related Id(s): PR-6351

               New trace feature call_memory. Similar to call_time
               tracing, but instead of measure accumulated time in
               traced functions it measures accumulated heap space
               consumed by traced functions. It can be used to compare
               how much different functions are contributing to
               garbage collection being triggered.


  OTP-18445    Application(s): erts, stdlib

               It is no longer necessary to enable a feature in the
               runtime system in order to load modules that are using
               it. It is sufficient to enable the feature in the
               compiler when compiling it.

               That means that to use feature maybe_expr in Erlang/OTP
               26, it is sufficient to enable it during compilation.

               In Erlang/OTP 27, feature maybe_expr will be enabled by
               default, but it will be possible to disable it.


  OTP-18459    Application(s): ssl

               Add encoding and decoding of use_srtp hello extension
               to facilitate for DTLS users to implement SRTP
               functionality.


  OTP-18491    Application(s): parsetools
               Related Id(s): PR-6882

               Leex has been extended with optional column number
               support.


  OTP-18495    Application(s): stdlib
               Related Id(s): PR-6943

               The family of enumeration functions in module lists has
               been extended with enumerate/3 that allows a step value
               to be supplied.


  OTP-18498    Application(s): erts

               Reintroduced the optimization that turned anonymous
               functions without free variables into literals
               (OTP-15195). This optimization was lost during
               refactoring in OTP 24.

               Alongside this fix, we plan to remove the "fun creator
               pid" feature in OTP 27. See Upcoming Potential
               Incompatibilities for more details.


  OTP-18500    Application(s): stdlib

               Update Unicode to version 15.0.0.


  OTP-18522    Application(s): dialyzer, erts, stdlib

               Added the new built-in type dynamic() introduced in
               EEP-61, improving support for gradual type checkers.


 ---------------------------------------------------------------------
 --- POTENTIAL INCOMPATIBILITIES -------------------------------------
 ---------------------------------------------------------------------

  OTP-17771    Application(s): erts
               Related Id(s): GH-5325, PR-6370

               The enif_set_option() function has been introduced into
               the NIF API. It can be used in order to set the
               ERL_NIF_OPT_DELAY_HALT and/or ERL_NIF_OPT_ON_HALT
               options with which one can synchronize halt of the
               runtime system with flushing enabled and execution of
               NIFs. Halt of the runtime system without flushing
               enabled, now terminates the runtime system without
               execution of atexit/on_exit handlers that may have been
               installed into the runtime system which might be
               considered a potential incompatibility.


  OTP-18135    Application(s): erts
               Related Id(s): GH-4965, PR-6046

               *** HIGHLIGHT ***

               As announced when OTP 25 was released, multi time warp
               mode is now enabled by default. This assumes that all
               code executing on the system is time warp safe.

               If you have old code in the system that is not time
               warp safe, you now explicitly need to start the system
               in no time warp mode (or singe time warp mode if it is
               partially time warp safe) in order to avoid problems.
               When starting the system in no time warp mode, the
               system behaves as it did prior to the introduction of
               the extended time functionality introduced in OTP 18.

               If you have code that is not time warp safe, you are
               strongly encouraged to change this so that you can use
               multi time warp mode. Compared to no time warp mode,
               multi time warp mode improves scalability and
               performance as well as accuracy and precision of time
               measurements.


  OTP-18140    Application(s): erl_interface, erts, jinterface,
               kernel
               Related Id(s): PR-6072

               As announced since the release of OTP 24, support for:

               -- version 4 node container types in the external term
               format are now mandatory. That is, references
               supporting up to 5 32-bit integer identifiers, and
               process and port identifiers with support for 64-bit
               data storage. The distribution flag DFLAG_V4_NC is
               therefor now also mandatory. OTP has since OTP 24
               supported this. Also note that the external format
               produced by term_to_binary() and term_to_iovec() will
               unconditionally produce pids, ports, and references
               supporting this larger format.

               -- the new link protocol introduced in OTP 23.3 is now
               mandatory. The distribution flag DFLAG_UNLINK_ID is
               therefor now also mandatory.

               Due to the above, OTP 26 nodes will refuse to connect
               to OTP nodes from releases prior to OTP 24.


  OTP-18168    Application(s): ssl
               Related Id(s): GH-6014, PR-6019

               With this change, stateless tickets generated by server
               with anti_replay option enabled can be used for
               creating ClientHello throughout ticket lifetime.
               Without this change, usability was limited to
               WindowSize number of seconds configured for anti_replay
               option.


  OTP-18210    Application(s): kernel
               Related Id(s): GH-5877, PR-5878

               Fix bug where duplicate keys were allowed in the .app
               file of an application. Duplicate keys are now rejected
               and the application will not start if they exist.


  OTP-18285    Application(s): kernel, ssh, stdlib
               Related Id(s): PR-6262

               Typing Ctrl+L in a shell now clears the screen and
               redraws the current line instead of only redrawing the
               current line. To only redraw the current line, you must
               now type Alt+L. This brings the behaviour of Ctrl+L
               closer to how bash and other shells work.


  OTP-18344    Application(s): erts, kernel
               Related Id(s): GH-6461, OTP-18324, PR-6481, PR-6522,
               PR-6944

               The following inet:setopts/2 options have been
               introduced:

               -- reuseport -- Reuse of local port. Load balancing may
               or may not be provided depending on underlying OS.

               -- reuseport_lb -- Reuse of local port. Load balancing
               provided.

               -- exclusiveaddruse -- Exclusive address/port usage on
               Windows. This socket option is Windows specific and
               will silently be ignored on other systems.

               The behavior of setting reuseaddr on Windows have
               changed in a *backwards incompatible* way. The
               underlying SO_REUSEADDR socket option is now only set
               if both the reusaddr and the reuseport inet options
               have been set. This since the underlying SO_REUSEADDR
               socket option on Windows behaves similar to how BSD
               behaves if both the underlying socket options
               SO_REUSEADDR and SO_REUSEPORT have been set. See the
               documentation of the reuseaddr option for more
               information.


  OTP-18389    Application(s): dialyzer
               Related Id(s): GH-6508, PR-6864

               Dialyzer was accepting typespecs containing singleton
               type variables that appeared in an union type.

               Before this change, singleton type variables in an
               union type were accepted (see example below). However,
               type variable Foo appears only once in each branch of
               the union type, so it is a singleton type variable (in
               each branch of the union type) that is not bound.

               -spec run_test(Opts) -> term() when Opts ::
               {join_specs, Foo} | {test, Foo}.

               Unbound type variables should be rejected by Dialyzer,
               which now detects this error and rejects it in the same
               manner as its non-union equivalent:

               -spec run_test_error(Opts) -> term() when Opts ::
               {join_specs, Foo}.


  OTP-18438    Application(s): ssl
               Related Id(s): GH-6679

               For security reasons remove support for SHA1 and DSA
               algorithms from default values.


  OTP-18439    Application(s): dialyzer
               Related Id(s): GH-5695, GH-6942, PR-6822

               Dialyzer has enabled (by default) warnings about
               unknown types and functions.

               Prior to this change, Dialyzer had warnings about
               unknown types and functions disabled (by default).

               This default value has been overwritten; Dialyzer now
               warns about unknown types and functions (as requested
               by the community in GH-5695). Thus, the following two
               examples are equivalent, i.e., passing the -Wunknown
               function is enabled by default:

               dialyzer moduler.erl -Wunknown -Wmissing_return

               dialyzer moduler.erl -Wmissing_return

               Dialyzer has a new flag, -Wno_unknown. Its purpose is
               to suppress warnings about unknown functions and types.

               Users who wish to suppress these warnings can invoke
               Dialyzer using this flag. Example: dialyzer module.erl
               -Wno_unknown


  OTP-18455    Application(s): ssl
               Related Id(s): GH-5899

               Change the client default verify option to verify_peer.
               Note that this makes it mandatory to also supply
               trusted CA certificates or explicitly set verify to
               verify_none. This also applies when using the so called
               anonymous test cipher suites defined in TLS versions
               pre TLS-1.3.


  OTP-18471    Application(s): kernel, stdlib
               Related Id(s): GH-6339, PR-6843

               proc_lib:start*/* has become synchronous when the
               started process fails. This requires that a failing
               process use a new function proc_lib:init_fail/2,3, or
               exits, to indicate failure. All OTP behaviours have
               been fixed to do this.

               All these start functions now consume the 'EXIT'
               message from a process link for all error returns.
               Previously it was only the start_link/* functions that
               did this, and only when the started function exited,
               not when it used init_ack/1,2 or init_fail/2,3 to
               create the return value.


  OTP-18488    Application(s): reltool
               Related Id(s): PR-6836

               Support for the experimental code archives feature has
               been removed from reltool.


  OTP-18490    Application(s): diameter, inets, mnesia, reltool,
               snmp, ssh, tftp, wx
               Related Id(s): GH-6339, OTP-18471, PR-6843

               The implementation has been fixed to use
               proc_lib:init_fail/2,3 where appropriate, instead of
               proc_lib:init_ack/1,2.


  OTP-18505    Application(s): erts
               Related Id(s): PR-6991

               The default encoding of atoms by term_to_binary and
               term_to_iovec have changed from Latin1 to UTF-8. The
               old encoding can still be obtained with options
               {minor_version, 1}.

               Apart from encoding code points between 128 and 255
               with two bytes (UTF-8) instead of one, most atoms will
               occupy one less byte as the length field use only one
               byte instead of two if possible.


 ---------------------------------------------------------------------
 --- OTP-26.0 --------------------------------------------------------
 ---------------------------------------------------------------------

 --- Fixed Bugs and Malfunctions ---

  OTP-18364    Application(s): otp

               Starting from Erlang/OTP 24, it has been possible to
               write expressions such as A = catch Expr without
               parentheses around the catch expression, but it was not
               mentioned in the documentation. It now is.


 --- Improvements and New Features ---

  OTP-18053    Application(s): erts, otp
               Related Id(s): PR-6101

               Updated configure cache for Windows. This makes
               configure run faster on windows as many more checks are
               cached.


  OTP-18209    Application(s): otp
               Related Id(s): PR-5881

               Fix the make target release, release_docs, install and
               install-docs now work when the target path contains
               whitespace and/or unicode characters.


  OTP-18492    Application(s): otp
               Related Id(s): GH-6706

               The documentation for the bit syntax has been updated
               to correct some factual errors and omissions.


  OTP-18511    Application(s): otp, stdlib
               Related Id(s): PR-7017

               The regular expression library powering the re module
               is likely to be changed in Erlang/OTP 27. See Upcoming
               Potential Incompatibilities.


 ---------------------------------------------------------------------
 --- asn1-5.1 --------------------------------------------------------
 ---------------------------------------------------------------------

 --- Improvements and New Features ---

  OTP-18441    Application(s): asn1

               Minor code improvements.


  OTP-18447    Application(s): asn1, crypto, erts, kernel,
               public_key, runtime_tools

               Handling of on_load modules during boot has been
               improved by adding an extra step in the boot order for
               embedded mode that runs all on_load handlers, instead
               of relying on explicit invocation of them, later, when
               the kernel supervision tree starts.

               This is mostly a code improvement and OTP internal
               simplification to avoid future bugs and to simplify
               code maintenance.


 Full runtime dependencies of asn1-5.1: erts-11.0, kernel-7.0,
 stdlib-3.13


 ---------------------------------------------------------------------
 --- common_test-1.25 ------------------------------------------------
 ---------------------------------------------------------------------

 --- Fixed Bugs and Malfunctions ---

  OTP-18377    Application(s): common_test
               Related Id(s): PR-6437

               This change improves Common Test docs (CT hook example
               code) and adds Emacs skeleton with hook code.


 --- Improvements and New Features ---

  OTP-18259    Application(s): common_test
               Related Id(s): PR-5924

               Updated common_test with a more robust way to fetch old
               releases, while ignoring the current release.


  OTP-18340    Application(s): common_test

               - re-write the XML ct module documentation into erlang
               types to make Dialyzer able to catch more precise
               errors


 Full runtime dependencies of common_test-1.25: compiler-6.0,
 crypto-4.5, debugger-4.1, erts-7.0, ftp-1.0, inets-6.0, kernel-8.4,
 observer-2.1, runtime_tools-1.8.16, sasl-2.5, snmp-5.1.2, ssh-4.0,
 stdlib-4.0, syntax_tools-1.7, tools-3.2, xmerl-1.3.8


 ---------------------------------------------------------------------
 --- compiler-8.3 ----------------------------------------------------
 ---------------------------------------------------------------------

 --- Improvements and New Features ---

  OTP-18126    Application(s): compiler, erts
               Related Id(s): PR-6033

               Optimized record updates.


  OTP-18137    Application(s): compiler, erts
               Related Id(s): PR-6259, PR-6404, PR-6576, PR-6804

               *** HIGHLIGHT ***

               There are several new optimization for binary syntax in
               the JIT:

               -- Creation and matching of binaries with segments of
               fixed sizes have been optimized.

               -- Creation and matching of UTF-8 segments have been
               optimized.

               -- Appending to binaries has been optimized.


  OTP-18185    Application(s): compiler, erts
               Related Id(s): GH-6139

               *** HIGHLIGHT ***

               The compiler and JIT now generate better code for
               creation of small maps where all keys are literals
               known at compile time.


  OTP-18297    Application(s): compiler, stdlib
               Related Id(s): GH-6348

               *** HIGHLIGHT ***

               A limitation in the binary syntax has been removed. It
               is now possible to match binary patterns in parallel.
               Example: <<A:8>> = <<B:4,C:4>> = Bin


  OTP-18337    Application(s): compiler, stdlib
               Related Id(s): GH-6477, PR-6503

               It is documented that $\^X is the ASCII code for
               Control X, where X is an uppercase or lowercase letter.
               However, this notation would work for any character X,
               even then it didn't make sense.

               In Erlang/OTP 26, it is now documented that the
               following characters are also allowed to follow the \^
               characters: @, [, \, ], ^, _, and ?. Attempt to use
               other characters will be rejected with a compiler
               error.

               The value for $\^? is now 127 (instead of 31 as in
               earlier releases).


  OTP-18367    Application(s): compiler, erts, stdlib
               Related Id(s): GH-6544

               *** HIGHLIGHT ***

               The BIFs min/2 and max/2 are now allowed to be used in
               guards and match specs.


  OTP-18413    Application(s): compiler, erts, stdlib, syntax_tools,
               tools
               Related Id(s): EEP-58, PR-6727

               *** HIGHLIGHT ***

               Map comprehensions as suggested in EEP 58 has now been
               implemented.


  OTP-18431    Application(s): compiler, stdlib
               Related Id(s): PR-6739

               *** HIGHLIGHT ***

               Improved the selective receive optimization, which can
               now be enabled for references returned from other
               functions.

               This greatly improves the performance of
               gen_server:send_request/3, gen_server:wait_response/2,
               and similar functions.


  OTP-18502    Application(s): compiler

               The compiler will now inline calls to maps:get/3.


 Full runtime dependencies of compiler-8.3: crypto-5.1, erts-13.0,
 kernel-8.4, stdlib-5.0


 ---------------------------------------------------------------------
 --- crypto-5.2 ------------------------------------------------------
 ---------------------------------------------------------------------

 --- Improvements and New Features ---

  OTP-18204    Application(s): crypto
               Related Id(s): PR-6203

               Add support for SHAKE128 and SHAKE256.


  OTP-18206    Application(s): crypto
               Related Id(s): PR-6167

               Make the -DOPENSSL_API_COMPAT flag work without
               warnings.


  OTP-18405    Application(s): crypto, diameter, kernel, ssl
               Related Id(s): GH-6672, PR-6700, PR-6702, PR-6768,
               PR-6769, PR-6812, PR-6814

               Replace size/1 with either tuple_size/1 or byte_size/1

               The size/1 BIF is not optimized by the JIT, and its use
               can result in worse types for Dialyzer.

               When one knows that the value being tested must be a
               tuple, tuple_size/1 should always be preferred.

               When one knows that the value being tested must be a
               binary, byte_size/1 should be preferred. However,
               byte_size/1 also accepts a bitstring (rounding up size
               to a whole number of bytes), so one must make sure that
               the call to byte_size/ is preceded by a call to
               is_binary/1 to ensure that bitstrings are rejected.
               Note that the compiler removes redundant calls to
               is_binary/1, so if one is not sure whether previous
               code had made sure that the argument is a binary, it
               does not harm to add an is_binary/1 test immediately
               before the call to byte_size/1.


  OTP-18447    Application(s): asn1, crypto, erts, kernel,
               public_key, runtime_tools

               Handling of on_load modules during boot has been
               improved by adding an extra step in the boot order for
               embedded mode that runs all on_load handlers, instead
               of relying on explicit invocation of them, later, when
               the kernel supervision tree starts.

               This is mostly a code improvement and OTP internal
               simplification to avoid future bugs and to simplify
               code maintenance.


 Full runtime dependencies of crypto-5.2: erts-9.0, kernel-5.3,
 stdlib-3.9


 ---------------------------------------------------------------------
 --- dialyzer-5.1 ----------------------------------------------------
 ---------------------------------------------------------------------

 --- Fixed Bugs and Malfunctions ---

  OTP-18237    Application(s): dialyzer
               Related Id(s): GH-6221, PR-6243

               When checking behaviors, Dialyzer could generate false
               warning that a callback function did not have the
               correct type according to the spec in the behavior
               definition.


  OTP-18276    Application(s): dialyzer
               Related Id(s): GH-6333

               In a spec, list(none()) used to mean none(). It has now
               been corrected to mean the empty list.


  OTP-18389    Application(s): dialyzer
               Related Id(s): GH-6508, PR-6864

               *** POTENTIAL INCOMPATIBILITY ***

               Dialyzer was accepting typespecs containing singleton
               type variables that appeared in an union type.

               Before this change, singleton type variables in an
               union type were accepted (see example below). However,
               type variable Foo appears only once in each branch of
               the union type, so it is a singleton type variable (in
               each branch of the union type) that is not bound.

               -spec run_test(Opts) -> term() when Opts ::
               {join_specs, Foo} | {test, Foo}.

               Unbound type variables should be rejected by Dialyzer,
               which now detects this error and rejects it in the same
               manner as its non-union equivalent:

               -spec run_test_error(Opts) -> term() when Opts ::
               {join_specs, Foo}.


  OTP-18485    Application(s): dialyzer
               Related Id(s): GH-6850, PR-6854

               Fixed a bug that prevented the --plts option from being
               used together with --add-to-plt.


 --- Improvements and New Features ---

  OTP-18188    Application(s): dialyzer
               Related Id(s): PR-5997

               *** HIGHLIGHT ***

               Dialyzer has a new incremental mode that be invoked by
               giving the --incremental option when running Dialyzer.
               This new incremental mode is likely to become the
               default in a future release.

               Incremental mode primarily differs from the previous,
               "classic", ways of running Dialyzer, in that its model
               is optimised around the common use case of regularly
               analysing a single codebase, tweaking the code,
               analysing it again, and so on, without explicit
               reference to the building and checking of a PLT.

               In this mode the PLT file acts much more like a true
               cache, where users provide a codebase and a set of
               files they care about, and Dialyzer does the legwork in
               terms of deciding how to most efficiently report all of
               the relevant warnings given the cached results it may
               already have in the PLT (and if a PLT doesn't exist,
               incremental mode will create one).


  OTP-18238    Application(s): dialyzer
               Related Id(s): PR-6271

               Dialyzer now produces clearer error messages for
               contract violations.


  OTP-18282    Application(s): dialyzer
               Related Id(s): GH-6132, PR-6335

               The name of a built-in type can now be reused as the
               name of type locally. That is useful when an OTP
               release introduces a new built-in type; having the
               possibility to redefine built-in types locally can make
               it easier to maintain code that works in multiple OTP
               releases.


  OTP-18310    Application(s): dialyzer

               There is new option -no_spec to ignore all specs. It is
               useful for debugging when one suspects that some specs
               could be incorrect.


  OTP-18342    Application(s): dialyzer
               Related Id(s): GH-6117, PR-6654

               Dialyzer's overloaded domain warning becomes is
               disabled by default, and can be enabled with the flag
               -Woverlapping_contract.

               Dialyzer used to issue a warning for overloaded domains
               stating "such contracts are currently unsupported and
               are simply ignored".

               These contracts are not "ignored" but rather, Dialyzer
               takes the union of the overloaded domains. This means
               that we lose the dependency from each corresponding
               input to output type. Because of this, the warning is
               really about not being able to establish a dependency
               between the input and output types of each respective
               overloaded function specification.


  OTP-18439    Application(s): dialyzer
               Related Id(s): GH-5695, GH-6942, PR-6822

               *** POTENTIAL INCOMPATIBILITY ***

               Dialyzer has enabled (by default) warnings about
               unknown types and functions.

               Prior to this change, Dialyzer had warnings about
               unknown types and functions disabled (by default).

               This default value has been overwritten; Dialyzer now
               warns about unknown types and functions (as requested
               by the community in GH-5695). Thus, the following two
               examples are equivalent, i.e., passing the -Wunknown
               function is enabled by default:

               dialyzer moduler.erl -Wunknown -Wmissing_return

               dialyzer moduler.erl -Wmissing_return

               Dialyzer has a new flag, -Wno_unknown. Its purpose is
               to suppress warnings about unknown functions and types.

               Users who wish to suppress these warnings can invoke
               Dialyzer using this flag. Example: dialyzer module.erl
               -Wno_unknown


  OTP-18522    Application(s): dialyzer, erts, stdlib

               *** HIGHLIGHT ***

               Added the new built-in type dynamic() introduced in
               EEP-61, improving support for gradual type checkers.


 Full runtime dependencies of dialyzer-5.1: compiler-8.0, erts-12.0,
 kernel-8.0, stdlib-4.0, syntax_tools-2.0, wx-2.0


 ---------------------------------------------------------------------
 --- diameter-2.3 ----------------------------------------------------
 ---------------------------------------------------------------------

 --- Improvements and New Features ---

  OTP-18405    Application(s): crypto, diameter, kernel, ssl
               Related Id(s): GH-6672, PR-6700, PR-6702, PR-6768,
               PR-6769, PR-6812, PR-6814

               Replace size/1 with either tuple_size/1 or byte_size/1

               The size/1 BIF is not optimized by the JIT, and its use
               can result in worse types for Dialyzer.

               When one knows that the value being tested must be a
               tuple, tuple_size/1 should always be preferred.

               When one knows that the value being tested must be a
               binary, byte_size/1 should be preferred. However,
               byte_size/1 also accepts a bitstring (rounding up size
               to a whole number of bytes), so one must make sure that
               the call to byte_size/ is preceded by a call to
               is_binary/1 to ensure that bitstrings are rejected.
               Note that the compiler removes redundant calls to
               is_binary/1, so if one is not sure whether previous
               code had made sure that the argument is a binary, it
               does not harm to add an is_binary/1 test immediately
               before the call to byte_size/1.


  OTP-18490    Application(s): diameter, inets, mnesia, reltool,
               snmp, ssh, tftp, wx
               Related Id(s): GH-6339, OTP-18471, PR-6843

               *** POTENTIAL INCOMPATIBILITY ***

               The implementation has been fixed to use
               proc_lib:init_fail/2,3 where appropriate, instead of
               proc_lib:init_ack/1,2.


 Full runtime dependencies of diameter-2.3: erts-10.0, kernel-3.2,
 ssl-9.0, stdlib-5.0


 ---------------------------------------------------------------------
 --- erl_docgen-1.5 --------------------------------------------------
 ---------------------------------------------------------------------

 --- Improvements and New Features ---

  OTP-18338    Application(s): erl_docgen
               Related Id(s): PR-6408

               New XML tag <change>. Like a <note> box, but with a
               different (steel blue) color and label. Intended to
               contain talk about semantic differences between OTP
               releases.


  OTP-18501    Application(s): erl_docgen
               Related Id(s): PR-6987

               Add "since" attribute to XML taglist/tag elements to
               document OTP version when a particular option/feature
               was introduced. The version is shown out in the right
               margin, similar to "since" versions for functions.


 Full runtime dependencies of erl_docgen-1.5: edoc-1.0, erts-11.0,
 kernel-8.0, stdlib-3.15, xmerl-1.3.7


 ---------------------------------------------------------------------
 --- erl_interface-5.4 -----------------------------------------------
 ---------------------------------------------------------------------

 --- Improvements and New Features ---

  OTP-18140    Application(s): erl_interface, erts, jinterface,
               kernel
               Related Id(s): PR-6072

               *** POTENTIAL INCOMPATIBILITY ***

               As announced since the release of OTP 24, support for:

               -- version 4 node container types in the external term
               format are now mandatory. That is, references
               supporting up to 5 32-bit integer identifiers, and
               process and port identifiers with support for 64-bit
               data storage. The distribution flag DFLAG_V4_NC is
               therefor now also mandatory. OTP has since OTP 24
               supported this. Also note that the external format
               produced by term_to_binary() and term_to_iovec() will
               unconditionally produce pids, ports, and references
               supporting this larger format.

               -- the new link protocol introduced in OTP 23.3 is now
               mandatory. The distribution flag DFLAG_UNLINK_ID is
               therefor now also mandatory.

               Due to the above, OTP 26 nodes will refuse to connect
               to OTP nodes from releases prior to OTP 24.


 --- Known Bugs and Problems ---

  OTP-16607    Application(s): erl_interface
               Related Id(s): OTP-16608

               The ei API for decoding/encoding terms is not fully
               64-bit compatible since terms that have a
               representation on the external term format larger than
               2 GB cannot be handled.


 ---------------------------------------------------------------------
 --- erts-14.0 -------------------------------------------------------
 ---------------------------------------------------------------------

 --- Fixed Bugs and Malfunctions ---

  OTP-18016    Application(s): erts

               If a local fun was called while reloading the *exact
               same* module that defined said fun, there was a small
               window in which the call would land in code that was
               yet to be fully loaded.


  OTP-18248    Application(s): erts, kernel
               Related Id(s): GH-6085, PR-6227

               Fix the TLS distribution to work when starting Erlang
               in embedded mode and a connection is done before kernel
               is fully started.


  OTP-18271    Application(s): erts, kernel
               Related Id(s): PR-6279

               erl -remsh has been improved to provide better error
               reasons and work when using a shell without terminal
               support (that is an "oldshell").


  OTP-18274    Application(s): erts
               Related Id(s): PR-6048

               Fix so that -fno-omit-frame-pointer is applied to all
               of the Erlang VM when using the JIT so that tools, such
               as perf, can crawl the process stacks.


  OTP-18277    Application(s): erts
               Related Id(s): PR-6306

               Compilation server now support unicode paths in
               compilation server for filesystems that are encoded
               with unicode.


  OTP-18498    Application(s): erts

               *** HIGHLIGHT ***

               Reintroduced the optimization that turned anonymous
               functions without free variables into literals
               (OTP-15195). This optimization was lost during
               refactoring in OTP 24.

               Alongside this fix, we plan to remove the "fun creator
               pid" feature in OTP 27. See Upcoming Potential
               Incompatibilities for more details.


 --- Improvements and New Features ---

  OTP-17771    Application(s): erts
               Related Id(s): GH-5325, PR-6370

               *** POTENTIAL INCOMPATIBILITY ***

               The enif_set_option() function has been introduced into
               the NIF API. It can be used in order to set the
               ERL_NIF_OPT_DELAY_HALT and/or ERL_NIF_OPT_ON_HALT
               options with which one can synchronize halt of the
               runtime system with flushing enabled and execution of
               NIFs. Halt of the runtime system without flushing
               enabled, now terminates the runtime system without
               execution of atexit/on_exit handlers that may have been
               installed into the runtime system which might be
               considered a potential incompatibility.


  OTP-17932    Application(s): erts, kernel, stdlib
               Related Id(s): GH-3150, GH-3390, GH-4225, GH-4343,
               PR-6144

               *** HIGHLIGHT ***

               The TTY/terminal subsystem has been rewritten from by
               moving more code to Erlang from the old linked-in
               driver and implementing all the I/O primitives needed
               in a NIF instead.

               On Unix platforms the user should not notice a lot of
               difference, besides better handling of unicode
               characters and fixing of some long standing bugs.

               Windows users will notice that erl.exe has the same
               functionality as a normal Unix shell and that werl.exe
               has been removed and replaced with a symlink to
               erl.exe. This makes the Windows Erlang terminal
               experience identical to that of Unix.

               The re-write brings with it a number of bug fixes and
               feature additions:

               -- The TTY is now reset when Erlang exits, fixing zsh
               to not break when terminating an Erlang session.

               -- standard_error now uses the same unicode mode as
               standard_io.

               -- Hitting backspace when searching the shell history
               with an empty search string no longer breaks the shell.

               -- Tab expansion now works on remote nodes started
               using the JCL interface.

               -- It is now possible to configure the shell slogan and
               the session slogans (that is the texts that appear when
               you start an Erlang shell). See the kernel
               documentation for more details.

               -- Added shell:start_interactive for starting the
               interactive shell from a non-interactive Erlang session
               (for example an escript).

               -- On Windows, when starting in detached mode the
               standard handler are now set to nul devices instead of
               being unset.


  OTP-18029    Application(s): erts, kernel

               Preparation for adding Windows support to 'socket'.


  OTP-18053    Application(s): erts, otp
               Related Id(s): PR-6101

               Updated configure cache for Windows. This makes
               configure run faster on windows as many more checks are
               cached.


  OTP-18126    Application(s): compiler, erts
               Related Id(s): PR-6033

               Optimized record updates.


  OTP-18131    Application(s): erts

               Optimized internal hash routines.


  OTP-18135    Application(s): erts
               Related Id(s): GH-4965, PR-6046

               *** HIGHLIGHT ***

               *** POTENTIAL INCOMPATIBILITY ***

               As announced when OTP 25 was released, multi time warp
               mode is now enabled by default. This assumes that all
               code executing on the system is time warp safe.

               If you have old code in the system that is not time
               warp safe, you now explicitly need to start the system
               in no time warp mode (or singe time warp mode if it is
               partially time warp safe) in order to avoid problems.
               When starting the system in no time warp mode, the
               system behaves as it did prior to the introduction of
               the extended time functionality introduced in OTP 18.

               If you have code that is not time warp safe, you are
               strongly encouraged to change this so that you can use
               multi time warp mode. Compared to no time warp mode,
               multi time warp mode improves scalability and
               performance as well as accuracy and precision of time
               measurements.


  OTP-18137    Application(s): compiler, erts
               Related Id(s): PR-6259, PR-6404, PR-6576, PR-6804

               *** HIGHLIGHT ***

               There are several new optimization for binary syntax in
               the JIT:

               -- Creation and matching of binaries with segments of
               fixed sizes have been optimized.

               -- Creation and matching of UTF-8 segments have been
               optimized.

               -- Appending to binaries has been optimized.


  OTP-18140    Application(s): erl_interface, erts, jinterface,
               kernel
               Related Id(s): PR-6072

               *** POTENTIAL INCOMPATIBILITY ***

               As announced since the release of OTP 24, support for:

               -- version 4 node container types in the external term
               format are now mandatory. That is, references
               supporting up to 5 32-bit integer identifiers, and
               process and port identifiers with support for 64-bit
               data storage. The distribution flag DFLAG_V4_NC is
               therefor now also mandatory. OTP has since OTP 24
               supported this. Also note that the external format
               produced by term_to_binary() and term_to_iovec() will
               unconditionally produce pids, ports, and references
               supporting this larger format.

               -- the new link protocol introduced in OTP 23.3 is now
               mandatory. The distribution flag DFLAG_UNLINK_ID is
               therefor now also mandatory.

               Due to the above, OTP 26 nodes will refuse to connect
               to OTP nodes from releases prior to OTP 24.


  OTP-18141    Application(s): erts
               Related Id(s): OTP-18140, PR-6073

               Optimization of process aliases made possible now that
               support for version 4 node container types in the
               external term format is mandatory.


  OTP-18185    Application(s): compiler, erts
               Related Id(s): GH-6139

               *** HIGHLIGHT ***

               The compiler and JIT now generate better code for
               creation of small maps where all keys are literals
               known at compile time.


  OTP-18227    Application(s): erts
               Related Id(s): PR-6254

               When erl -eval fails to execute the command is not
               printed to standard_error.


  OTP-18334    Application(s): erts
               Related Id(s): PR-6434

               *** HIGHLIGHT ***

               Support for UTF-8 atoms and strings in the NIF
               interface including new functions enif_make_new_atom,
               enif_make_new_atom_len and enif_get_string_length.


  OTP-18344    Application(s): erts, kernel
               Related Id(s): GH-6461, OTP-18324, PR-6481, PR-6522,
               PR-6944

               *** POTENTIAL INCOMPATIBILITY ***

               The following inet:setopts/2 options have been
               introduced:

               -- reuseport -- Reuse of local port. Load balancing may
               or may not be provided depending on underlying OS.

               -- reuseport_lb -- Reuse of local port. Load balancing
               provided.

               -- exclusiveaddruse -- Exclusive address/port usage on
               Windows. This socket option is Windows specific and
               will silently be ignored on other systems.

               The behavior of setting reuseaddr on Windows have
               changed in a *backwards incompatible* way. The
               underlying SO_REUSEADDR socket option is now only set
               if both the reusaddr and the reuseport inet options
               have been set. This since the underlying SO_REUSEADDR
               socket option on Windows behaves similar to how BSD
               behaves if both the underlying socket options
               SO_REUSEADDR and SO_REUSEPORT have been set. See the
               documentation of the reuseaddr option for more
               information.


  OTP-18360    Application(s): erts
               Related Id(s): PR-6497

               erlang:display/1 will now print large maps in a more
               readable way (similar to how small maps are printed).


  OTP-18367    Application(s): compiler, erts, stdlib
               Related Id(s): GH-6544

               *** HIGHLIGHT ***

               The BIFs min/2 and max/2 are now allowed to be used in
               guards and match specs.


  OTP-18369    Application(s): erts

               Fail enif_init_resource_type and friends by returning
               NULL if not called during load/upgrade. Old behavior
               was undefined.


  OTP-18410    Application(s): erts
               Related Id(s): GH-5889, PR-6345

               New option include_shared_binaries for the
               max_heap_size process limit. If set to true, large
               binaries (> 64 bytes), which may be referred by several
               processes, are included in the memory sum compared
               against the max_heap_size limit.


  OTP-18413    Application(s): compiler, erts, stdlib, syntax_tools,
               tools
               Related Id(s): EEP-58, PR-6727

               *** HIGHLIGHT ***

               Map comprehensions as suggested in EEP 58 has now been
               implemented.


  OTP-18414    Application(s): erts, stdlib
               Related Id(s): PR-6151

               *** HIGHLIGHT ***

               Some map operations have been optimized by changing the
               internal sort order of atom keys. This changes the
               (undocumented) order of how atom keys in small maps are
               printed and returned by maps:to_list/1 and maps:next/1.
               The new order is unpredictable and may change between
               different invocations of the Erlang VM.

               For applications where order is important, there is a
               new function maps:iterator/2 for creating iterators
               that return the map elements in a deterministic order.
               There are also new modifiers k and K for the format
               string for io:format() to support printing map elements
               ordered.


  OTP-18424    Application(s): erts
               Related Id(s): PR-6716

               Reduced memory usage of file:read_file_info/1,2


  OTP-18425    Application(s): erts
               Related Id(s): GH-5333, PR-6628

               Add new function current_stacktrace for trace match
               specifications used by erlang:trace_pattern/3.

               This new option puts the current stacktrace of the
               caller into the trace message sent to the trace
               receiver.


  OTP-18435    Application(s): erts
               Related Id(s): PR-6827

               *** HIGHLIGHT ***

               The amount of significant bits in node local process
               identifiers and port identifiers has been extended from
               28 bits to 60 bits on 64-bit runtime systems. This
               makes these identifiers large enough to in practice
               never having to be reused during the life time of a
               node.


  OTP-18440    Application(s): erts
               Related Id(s): PR-6351

               *** HIGHLIGHT ***

               New trace feature call_memory. Similar to call_time
               tracing, but instead of measure accumulated time in
               traced functions it measures accumulated heap space
               consumed by traced functions. It can be used to compare
               how much different functions are contributing to
               garbage collection being triggered.


  OTP-18445    Application(s): erts, stdlib

               *** HIGHLIGHT ***

               It is no longer necessary to enable a feature in the
               runtime system in order to load modules that are using
               it. It is sufficient to enable the feature in the
               compiler when compiling it.

               That means that to use feature maybe_expr in Erlang/OTP
               26, it is sufficient to enable it during compilation.

               In Erlang/OTP 27, feature maybe_expr will be enabled by
               default, but it will be possible to disable it.


  OTP-18447    Application(s): asn1, crypto, erts, kernel,
               public_key, runtime_tools

               Handling of on_load modules during boot has been
               improved by adding an extra step in the boot order for
               embedded mode that runs all on_load handlers, instead
               of relying on explicit invocation of them, later, when
               the kernel supervision tree starts.

               This is mostly a code improvement and OTP internal
               simplification to avoid future bugs and to simplify
               code maintenance.


  OTP-18477    Application(s): erts
               Related Id(s): PR-7006

               Introduced the local option of term_to_binary/2 and
               term_to_iovec/2.


  OTP-18483    Application(s): erts
               Related Id(s): PR-6888

               Document the commonly used practice to create and store
               static atoms at NIF load time in callbacks load or
               upgrade.


  OTP-18493    Application(s): erts
               Related Id(s): PR-6272

               Optimize ets:lookup_element for uncompressed tables by
               using a more efficient method to copy the term from ETS
               to the heap of the calling process.


  OTP-18505    Application(s): erts
               Related Id(s): PR-6991

               *** POTENTIAL INCOMPATIBILITY ***

               The default encoding of atoms by term_to_binary and
               term_to_iovec have changed from Latin1 to UTF-8. The
               old encoding can still be obtained with options
               {minor_version, 1}.

               Apart from encoding code points between 128 and 255
               with two bytes (UTF-8) instead of one, most atoms will
               occupy one less byte as the length field use only one
               byte instead of two if possible.


  OTP-18517    Application(s): erts

               The version of zlib included in the Erlang/OTP source
               code is now 1.2.13.


  OTP-18520    Application(s): erts
               Related Id(s): GH-6455

               gen_tcp:send/*, gen_udp:send/* and gen_sctp:send/* have
               been optimized to use the infamous receive reference
               optimization, so now sending should not have bad
               performance when the calling process has a large
               message queue.


  OTP-18522    Application(s): dialyzer, erts, stdlib

               *** HIGHLIGHT ***

               Added the new built-in type dynamic() introduced in
               EEP-61, improving support for gradual type checkers.


  OTP-18523    Application(s): erts
               Related Id(s): PR-7004

               Optimize maps:merge/2 memory consumption for small maps
               (<33 keys) by reusing key tuples or entire maps if the
               result map has the same number of keys as any of the
               argument maps.


  OTP-18524    Application(s): erts
               Related Id(s): OTP-18523, PR-7004

               Optimize maps:merge/2 memory consumption further for
               small maps by mutating 2nd map to use literal key tuple
               of 1st map if both have the same keys.


 Full runtime dependencies of erts-14.0: kernel-9.0, sasl-3.3,
 stdlib-4.1


 ---------------------------------------------------------------------
 --- ftp-1.1.5 -------------------------------------------------------
 ---------------------------------------------------------------------

 --- Fixed Bugs and Malfunctions ---

  OTP-18359    Application(s): ftp
               Related Id(s): PR-6545

               Fixes the documentation for the ftp module and updates
               the typing of ftp functions that return errors.

               The documentation has been improved and the types of
               the functions are now read from source code, instead of
               being hard-coded in XML.

               Functions returning errors of the form {error, Reason
               :: 'ehost' | ...} are now similar to other modules,
               i.e., {error, Reason :: term()}. If one wants to
               understand the error, one must call the function
               ftp:formaterror({error, Reason}).


 Full runtime dependencies of ftp-1.1.5: erts-7.0, kernel-6.0,
 runtime_tools-1.15.1, ssl-10.2, stdlib-3.5


 ---------------------------------------------------------------------
 --- inets-8.4 -------------------------------------------------------
 ---------------------------------------------------------------------

 --- Fixed Bugs and Malfunctions ---

  OTP-18476    Application(s): inets
               Related Id(s): GH-6380

               Correct timing related pipelining/keepalive queue bug,
               that could result in unexpected "socket_remotly_closed"
               errors.


 --- Improvements and New Features ---

  OTP-18167    Application(s): inets

               By default ssl connections will use options from
               ssl_default_options(true)


  OTP-18350    Application(s): inets, observer, os_mon, reltool, wx

               Runtime dependencies have been updated.


  OTP-18490    Application(s): diameter, inets, mnesia, reltool,
               snmp, ssh, tftp, wx
               Related Id(s): GH-6339, OTP-18471, PR-6843

               *** POTENTIAL INCOMPATIBILITY ***

               The implementation has been fixed to use
               proc_lib:init_fail/2,3 where appropriate, instead of
               proc_lib:init_ack/1,2.


 Full runtime dependencies of inets-8.4: erts-14.0, kernel-9.0,
 mnesia-4.12, public_key-1.13, runtime_tools-1.8.14, ssl-9.0,
 stdlib-5.0, stdlib-5.0


 ---------------------------------------------------------------------
 --- jinterface-1.14 -------------------------------------------------
 ---------------------------------------------------------------------

 --- Improvements and New Features ---

  OTP-18140    Application(s): erl_interface, erts, jinterface,
               kernel
               Related Id(s): PR-6072

               *** POTENTIAL INCOMPATIBILITY ***

               As announced since the release of OTP 24, support for:

               -- version 4 node container types in the external term
               format are now mandatory. That is, references
               supporting up to 5 32-bit integer identifiers, and
               process and port identifiers with support for 64-bit
               data storage. The distribution flag DFLAG_V4_NC is
               therefor now also mandatory. OTP has since OTP 24
               supported this. Also note that the external format
               produced by term_to_binary() and term_to_iovec() will
               unconditionally produce pids, ports, and references
               supporting this larger format.

               -- the new link protocol introduced in OTP 23.3 is now
               mandatory. The distribution flag DFLAG_UNLINK_ID is
               therefor now also mandatory.

               Due to the above, OTP 26 nodes will refuse to connect
               to OTP nodes from releases prior to OTP 24.


 ---------------------------------------------------------------------
 --- kernel-9.0 ------------------------------------------------------
 ---------------------------------------------------------------------

 --- Fixed Bugs and Malfunctions ---

  OTP-18210    Application(s): kernel
               Related Id(s): GH-5877, PR-5878

               *** POTENTIAL INCOMPATIBILITY ***

               Fix bug where duplicate keys were allowed in the .app
               file of an application. Duplicate keys are now rejected
               and the application will not start if they exist.


  OTP-18225    Application(s): kernel
               Related Id(s): PR-6036

               Fix inconsistent handling in logger_formatter of the
               branched values in conditional branches. For example
               using msg in a conditional branch would not be
               formatted as it should before this fix.


  OTP-18226    Application(s): kernel
               Related Id(s): PR-6253

               Fix the logger_std_h handler to log to standard_error
               if logging to standard_io fails for any reason.


  OTP-18248    Application(s): erts, kernel
               Related Id(s): GH-6085, PR-6227

               Fix the TLS distribution to work when starting Erlang
               in embedded mode and a connection is done before kernel
               is fully started.


  OTP-18271    Application(s): erts, kernel
               Related Id(s): PR-6279

               erl -remsh has been improved to provide better error
               reasons and work when using a shell without terminal
               support (that is an "oldshell").


  OTP-18286    Application(s): kernel
               Related Id(s): PR-5955

               Fix logging of log events generated before kernel is
               started to not fail if the code for formatting those
               log messaged have not yet been loaded.


  OTP-18471    Application(s): kernel, stdlib
               Related Id(s): GH-6339, PR-6843

               *** POTENTIAL INCOMPATIBILITY ***

               proc_lib:start*/* has become synchronous when the
               started process fails. This requires that a failing
               process use a new function proc_lib:init_fail/2,3, or
               exits, to indicate failure. All OTP behaviours have
               been fixed to do this.

               All these start functions now consume the 'EXIT'
               message from a process link for all error returns.
               Previously it was only the start_link/* functions that
               did this, and only when the started function exited,
               not when it used init_ack/1,2 or init_fail/2,3 to
               create the return value.


  OTP-18486    Application(s): kernel, stdlib
               Related Id(s): PR-6881

               Fixed a bug where file:read(standard_io, ...)
               unexpectedly returned eof in binary mode.


 --- Improvements and New Features ---

  OTP-14835    Application(s): kernel, stdlib
               Related Id(s): PR-5924

               *** HIGHLIGHT ***

               The Erlang shell has been improved to support the
               following features:

               -- Auto-complete variables, record names, record field
               names, map keys, function parameter types and
               filenames.

               -- Open external editor in the shell (with C-o) to edit
               the current expression in an editor.

               -- Support defining records (with types), functions and
               function typespecs, and custom types in the shell.

               -- Do not save pager commands, and input to io:getline
               in history.


  OTP-17932    Application(s): erts, kernel, stdlib
               Related Id(s): GH-3150, GH-3390, GH-4225, GH-4343,
               PR-6144

               *** HIGHLIGHT ***

               The TTY/terminal subsystem has been rewritten from by
               moving more code to Erlang from the old linked-in
               driver and implementing all the I/O primitives needed
               in a NIF instead.

               On Unix platforms the user should not notice a lot of
               difference, besides better handling of unicode
               characters and fixing of some long standing bugs.

               Windows users will notice that erl.exe has the same
               functionality as a normal Unix shell and that werl.exe
               has been removed and replaced with a symlink to
               erl.exe. This makes the Windows Erlang terminal
               experience identical to that of Unix.

               The re-write brings with it a number of bug fixes and
               feature additions:

               -- The TTY is now reset when Erlang exits, fixing zsh
               to not break when terminating an Erlang session.

               -- standard_error now uses the same unicode mode as
               standard_io.

               -- Hitting backspace when searching the shell history
               with an empty search string no longer breaks the shell.

               -- Tab expansion now works on remote nodes started
               using the JCL interface.

               -- It is now possible to configure the shell slogan and
               the session slogans (that is the texts that appear when
               you start an Erlang shell). See the kernel
               documentation for more details.

               -- Added shell:start_interactive for starting the
               interactive shell from a non-interactive Erlang session
               (for example an escript).

               -- On Windows, when starting in detached mode the
               standard handler are now set to nul devices instead of
               being unset.


  OTP-18029    Application(s): erts, kernel

               Preparation for adding Windows support to 'socket'.


  OTP-18140    Application(s): erl_interface, erts, jinterface,
               kernel
               Related Id(s): PR-6072

               *** POTENTIAL INCOMPATIBILITY ***

               As announced since the release of OTP 24, support for:

               -- version 4 node container types in the external term
               format are now mandatory. That is, references
               supporting up to 5 32-bit integer identifiers, and
               process and port identifiers with support for 64-bit
               data storage. The distribution flag DFLAG_V4_NC is
               therefor now also mandatory. OTP has since OTP 24
               supported this. Also note that the external format
               produced by term_to_binary() and term_to_iovec() will
               unconditionally produce pids, ports, and references
               supporting this larger format.

               -- the new link protocol introduced in OTP 23.3 is now
               mandatory. The distribution flag DFLAG_UNLINK_ID is
               therefor now also mandatory.

               Due to the above, OTP 26 nodes will refuse to connect
               to OTP nodes from releases prior to OTP 24.


  OTP-18235    Application(s): kernel, ssl
               Related Id(s): PR-5840, PR-6104

               *** HIGHLIGHT ***

               Support for Kernel TLS (kTLS), has been added to the
               SSL application, for TLS distribution (-proto_dist
               inet_tls), the SSL option {ktls, true}. Using this for
               general SSL sockets is uncomfortable, undocumented and
               not recommended since it requires very platform
               dependent raw options.

               This, for now, only works for some not too old Linux
               distributions. Roughly, a kernel 5.2.0 or later with
               support for UserLand Protocols and the kernel module
               tls is required.


  OTP-18261    Application(s): kernel
               Related Id(s): PR-5924

               Add code:get_doc/2 which adds support to fetch
               documentation skeletons of functions using debug_info
               chunks instead of eep48 doc chunks.


  OTP-18278    Application(s): kernel, stdlib
               Related Id(s): PR-6260

               *** HIGHLIGHT ***

               The Erlang shell's auto-completion when typing tab has
               been changed to happen after the editing current line
               instead of before it.

               This behaviour can be configured using a the
               shell_expand_location STDLIB configuration parameter.


  OTP-18285    Application(s): kernel, ssh, stdlib
               Related Id(s): PR-6262

               *** POTENTIAL INCOMPATIBILITY ***

               Typing Ctrl+L in a shell now clears the screen and
               redraws the current line instead of only redrawing the
               current line. To only redraw the current line, you must
               now type Alt+L. This brings the behaviour of Ctrl+L
               closer to how bash and other shells work.


  OTP-18305    Application(s): kernel
               Related Id(s): PR-5831

               gen_server optimized by caching callback functions


  OTP-18327    Application(s): kernel
               Related Id(s): PR-6433

               Prepare the pg communication protocol for upgrade. The
               plan is for OTP-28 nodes to be able to use an upgraded
               pg protocol while still being able to talk with OTP 26
               nodes.


  OTP-18344    Application(s): erts, kernel
               Related Id(s): GH-6461, OTP-18324, PR-6481, PR-6522,
               PR-6944

               *** POTENTIAL INCOMPATIBILITY ***

               The following inet:setopts/2 options have been
               introduced:

               -- reuseport -- Reuse of local port. Load balancing may
               or may not be provided depending on underlying OS.

               -- reuseport_lb -- Reuse of local port. Load balancing
               provided.

               -- exclusiveaddruse -- Exclusive address/port usage on
               Windows. This socket option is Windows specific and
               will silently be ignored on other systems.

               The behavior of setting reuseaddr on Windows have
               changed in a *backwards incompatible* way. The
               underlying SO_REUSEADDR socket option is now only set
               if both the reusaddr and the reuseport inet options
               have been set. This since the underlying SO_REUSEADDR
               socket option on Windows behaves similar to how BSD
               behaves if both the underlying socket options
               SO_REUSEADDR and SO_REUSEPORT have been set. See the
               documentation of the reuseaddr option for more
               information.


  OTP-18405    Application(s): crypto, diameter, kernel, ssl
               Related Id(s): GH-6672, PR-6700, PR-6702, PR-6768,
               PR-6769, PR-6812, PR-6814

               Replace size/1 with either tuple_size/1 or byte_size/1

               The size/1 BIF is not optimized by the JIT, and its use
               can result in worse types for Dialyzer.

               When one knows that the value being tested must be a
               tuple, tuple_size/1 should always be preferred.

               When one knows that the value being tested must be a
               binary, byte_size/1 should be preferred. However,
               byte_size/1 also accepts a bitstring (rounding up size
               to a whole number of bytes), so one must make sure that
               the call to byte_size/ is preceded by a call to
               is_binary/1 to ensure that bitstrings are rejected.
               Note that the compiler removes redundant calls to
               is_binary/1, so if one is not sure whether previous
               code had made sure that the argument is a binary, it
               does not harm to add an is_binary/1 test immediately
               before the call to byte_size/1.


  OTP-18419    Application(s): kernel

               The function file:pid2name/1 is deprecated and will be
               removed in Erlang/OTP 27.


  OTP-18442    Application(s): kernel
               Related Id(s): GH-6606, PR-6786

               The modules Erlang DNS resolver inet_res and helper
               modules have been updated for RFC6891; to handle OPT RR
               with DNSSEC OK (DO) bit.


  OTP-18444    Application(s): kernel
               Related Id(s): PR-6035

               Introduced application:get_supervisor/1.


  OTP-18447    Application(s): asn1, crypto, erts, kernel,
               public_key, runtime_tools

               Handling of on_load modules during boot has been
               improved by adding an extra step in the boot order for
               embedded mode that runs all on_load handlers, instead
               of relying on explicit invocation of them, later, when
               the kernel supervision tree starts.

               This is mostly a code improvement and OTP internal
               simplification to avoid future bugs and to simplify
               code maintenance.


  OTP-18448    Application(s): kernel
               Related Id(s): PR-6736

               Reduce contention on the code_server by doing the code
               preparation on the client.


  OTP-18451    Application(s): kernel
               Related Id(s): PR-6737

               Added a mode to ensure_all_loaded, to start children
               application and their dependencies concurrently.


  OTP-18452    Application(s): kernel
               Related Id(s): PR-6729

               Cache OTP boot code paths, to limit how many folders
               that are being accessed during a module lookup. Can be
               disabled with -cache_boot_path false. OTP boot code
               paths consists of ERL_LIB environment variables. The
               various otp/*/ebin folders. And the {path, ...} clauses
               in the init script.


  OTP-18456    Application(s): kernel, ssl

               Erlang distribution code in Kernel and SSL has been
               refactored a bit to facilitate debugging and
               re-usability, which shouldn't have any noticeable
               effects on behaviour or performance.


  OTP-18466    Application(s): kernel
               Related Id(s): PR-6832

               Add cache attribute to code path apis.

               Added an optional cache/nocache argument to all
               code:add_path*, code:set_path*, and code:replace_path*
               functions. These functions will then avoid doing
               file-accesses if they are cached. Cache can be cleared
               with code:clear_cache/0. Added code:del_paths/1 to make
               it easier to clear multiple paths.


  OTP-18484    Application(s): kernel
               Related Id(s): PR-6844

               Improvements to code:ensure_modules_loaded/1:
               Previously it would prepare modules and then abandon
               references to said modules if they had on_load
               callbacks. This pull request makes it so they keep the
               references around and then serially load them without
               having to fetch the object code and prepare them again.


  OTP-18510    Application(s): kernel
               Related Id(s): GH-6098, PR-6982

               The internal DNS resolver has bee updated to handle DNS
               LOC RR:s (RFC 1876). This is an undocumented module,
               although still used by power users. See the source
               code.


  OTP-18521    Application(s): kernel
               Related Id(s): PR-7025

               Reduced memory consumption in global when informing
               other nodes about lost connections.


 Full runtime dependencies of kernel-9.0: crypto-5.0, erts-14.0,
 sasl-3.0, stdlib-5.0


 ---------------------------------------------------------------------
 --- mnesia-4.22 -----------------------------------------------------
 ---------------------------------------------------------------------

 --- Improvements and New Features ---

  OTP-18309    Application(s): mnesia
               Related Id(s): PR-6377

               Added debug statistics for active transactions.


  OTP-18490    Application(s): diameter, inets, mnesia, reltool,
               snmp, ssh, tftp, wx
               Related Id(s): GH-6339, OTP-18471, PR-6843

               *** POTENTIAL INCOMPATIBILITY ***

               The implementation has been fixed to use
               proc_lib:init_fail/2,3 where appropriate, instead of
               proc_lib:init_ack/1,2.


 Full runtime dependencies of mnesia-4.22: erts-9.0, kernel-5.3,
 stdlib-5.0


 ---------------------------------------------------------------------
 --- observer-2.15 ---------------------------------------------------
 ---------------------------------------------------------------------

 --- Improvements and New Features ---

  OTP-18350    Application(s): inets, observer, os_mon, reltool, wx

               Runtime dependencies have been updated.


  OTP-18430    Application(s): observer
               Related Id(s): PR-6397

               Added start/1, start_and_wait functions/1|2 functions.


 Full runtime dependencies of observer-2.15: erts-14.0, et-1.5,
 kernel-9.0, runtime_tools-1.19, stdlib-5.0, wx-2.3


 ---------------------------------------------------------------------
 --- os_mon-2.9 ------------------------------------------------------
 ---------------------------------------------------------------------

 --- Fixed Bugs and Malfunctions ---

  OTP-18246    Application(s): os_mon
               Related Id(s): GH-6156, PR-6284

               Fix internal os_mon_sysinfo:get_disk_info/1 function to
               not crash when run on Windows with multiple drives.


 --- Improvements and New Features ---

  OTP-18303    Application(s): os_mon
               Related Id(s): PR-6384

               The disksup:get_disk_info/0 and disksup:get_disk_info/1
               functions have been introduced. These can be used in
               order to immediately fetch information about current
               disk usage.


  OTP-18350    Application(s): inets, observer, os_mon, reltool, wx

               Runtime dependencies have been updated.


 Full runtime dependencies of os_mon-2.9: erts-14.0, kernel-9.0,
 sasl-4.2.1, stdlib-5.0


 ---------------------------------------------------------------------
 --- parsetools-2.5 --------------------------------------------------
 ---------------------------------------------------------------------

 --- Improvements and New Features ---

  OTP-18491    Application(s): parsetools
               Related Id(s): PR-6882

               *** HIGHLIGHT ***

               Leex has been extended with optional column number
               support.


 Full runtime dependencies of parsetools-2.5: erts-6.0, kernel-3.0,
 stdlib-3.4


 ---------------------------------------------------------------------
 --- public_key-1.14 -------------------------------------------------
 ---------------------------------------------------------------------

 --- Improvements and New Features ---

  OTP-18447    Application(s): asn1, crypto, erts, kernel,
               public_key, runtime_tools

               Handling of on_load modules during boot has been
               improved by adding an extra step in the boot order for
               embedded mode that runs all on_load handlers, instead
               of relying on explicit invocation of them, later, when
               the kernel supervision tree starts.

               This is mostly a code improvement and OTP internal
               simplification to avoid future bugs and to simplify
               code maintenance.


 Full runtime dependencies of public_key-1.14: asn1-3.0, crypto-4.6,
 erts-6.0, kernel-3.0, stdlib-3.5


 ---------------------------------------------------------------------
 --- reltool-1.0 -----------------------------------------------------
 ---------------------------------------------------------------------

 --- Improvements and New Features ---

  OTP-18230    Application(s): reltool
               Related Id(s): PR-5936

               Add possibility to strip specific chunks from beam
               files included in a release. Before this change it was
               only possible to strip all chunks from the beam files.


  OTP-18350    Application(s): inets, observer, os_mon, reltool, wx

               Runtime dependencies have been updated.


  OTP-18488    Application(s): reltool
               Related Id(s): PR-6836

               *** POTENTIAL INCOMPATIBILITY ***

               Support for the experimental code archives feature has
               been removed from reltool.


  OTP-18490    Application(s): diameter, inets, mnesia, reltool,
               snmp, ssh, tftp, wx
               Related Id(s): GH-6339, OTP-18471, PR-6843

               *** POTENTIAL INCOMPATIBILITY ***

               The implementation has been fixed to use
               proc_lib:init_fail/2,3 where appropriate, instead of
               proc_lib:init_ack/1,2.


 Full runtime dependencies of reltool-1.0: erts-14.0, kernel-9.0,
 sasl-4.2.1, stdlib-5.0, stdlib-5.0, tools-2.6.14, wx-2.3


 ---------------------------------------------------------------------
 --- runtime_tools-1.20 ----------------------------------------------
 ---------------------------------------------------------------------

 --- Fixed Bugs and Malfunctions ---

  OTP-18499    Application(s): runtime_tools
               Related Id(s): PR-6946

               Fixed the type specification for
               instrument:carriers/0,1


 --- Improvements and New Features ---

  OTP-18211    Application(s): runtime_tools
               Related Id(s): PR-6143

               Add dbg:tracer(file, Filename) as a convenient way to
               trace to a file in clean text.


  OTP-18447    Application(s): asn1, crypto, erts, kernel,
               public_key, runtime_tools

               Handling of on_load modules during boot has been
               improved by adding an extra step in the boot order for
               embedded mode that runs all on_load handlers, instead
               of relying on explicit invocation of them, later, when
               the kernel supervision tree starts.

               This is mostly a code improvement and OTP internal
               simplification to avoid future bugs and to simplify
               code maintenance.


  OTP-18487    Application(s): runtime_tools, tools
               Related Id(s): PR-6829

               The instrument module has been moved from tools to
               runtime_tools.


 Full runtime dependencies of runtime_tools-1.20: erts-11.0,
 kernel-8.1, mnesia-4.12, stdlib-3.13


 ---------------------------------------------------------------------
 --- sasl-4.2.1 ------------------------------------------------------
 ---------------------------------------------------------------------

 --- Fixed Bugs and Malfunctions ---

  OTP-18300    Application(s): sasl
               Related Id(s): PR-6389

               Improve error message from systools:make_script, when
               .app parameters contain duplicates. The parameters that
               will be checked are modules, applications and
               registered.


 Full runtime dependencies of sasl-4.2.1: erts-10.2, kernel-6.0,
 stdlib-4.0, tools-2.6.14


 ---------------------------------------------------------------------
 --- snmp-5.14 -------------------------------------------------------
 ---------------------------------------------------------------------

 --- Improvements and New Features ---

  OTP-18490    Application(s): diameter, inets, mnesia, reltool,
               snmp, ssh, tftp, wx
               Related Id(s): GH-6339, OTP-18471, PR-6843

               *** POTENTIAL INCOMPATIBILITY ***

               The implementation has been fixed to use
               proc_lib:init_fail/2,3 where appropriate, instead of
               proc_lib:init_ack/1,2.


 Full runtime dependencies of snmp-5.14: crypto-4.6, erts-12.0,
 kernel-8.0, mnesia-4.12, runtime_tools-1.8.14, stdlib-5.0


 ---------------------------------------------------------------------
 --- ssh-5.0 ---------------------------------------------------------
 ---------------------------------------------------------------------

 --- Improvements and New Features ---

  OTP-18231    Application(s): ssh
               Related Id(s): OTP-17932, PR-6144

               The ssh_cli has been updated to work with the changes
               introduced in the new Erlang shell implementation.


  OTP-18285    Application(s): kernel, ssh, stdlib
               Related Id(s): PR-6262

               *** POTENTIAL INCOMPATIBILITY ***

               Typing Ctrl+L in a shell now clears the screen and
               redraws the current line instead of only redrawing the
               current line. To only redraw the current line, you must
               now type Alt+L. This brings the behaviour of Ctrl+L
               closer to how bash and other shells work.


  OTP-18490    Application(s): diameter, inets, mnesia, reltool,
               snmp, ssh, tftp, wx
               Related Id(s): GH-6339, OTP-18471, PR-6843

               *** POTENTIAL INCOMPATIBILITY ***

               The implementation has been fixed to use
               proc_lib:init_fail/2,3 where appropriate, instead of
               proc_lib:init_ack/1,2.


 Full runtime dependencies of ssh-5.0: crypto-5.0, erts-14.0,
 kernel-9.0, public_key-1.6.1, runtime_tools-1.15.1, stdlib-5.0,
 stdlib-5.0


 ---------------------------------------------------------------------
 --- ssl-11.0 --------------------------------------------------------
 ---------------------------------------------------------------------

 --- Improvements and New Features ---

  OTP-15903    Application(s): ssl

               Improved error checking and handling of ssl options.


  OTP-18168    Application(s): ssl
               Related Id(s): GH-6014, PR-6019

               *** POTENTIAL INCOMPATIBILITY ***

               With this change, stateless tickets generated by server
               with anti_replay option enabled can be used for
               creating ClientHello throughout ticket lifetime.
               Without this change, usability was limited to
               WindowSize number of seconds configured for anti_replay
               option.


  OTP-18235    Application(s): kernel, ssl
               Related Id(s): PR-5840, PR-6104

               *** HIGHLIGHT ***

               Support for Kernel TLS (kTLS), has been added to the
               SSL application, for TLS distribution (-proto_dist
               inet_tls), the SSL option {ktls, true}. Using this for
               general SSL sockets is uncomfortable, undocumented and
               not recommended since it requires very platform
               dependent raw options.

               This, for now, only works for some not too old Linux
               distributions. Roughly, a kernel 5.2.0 or later with
               support for UserLand Protocols and the kernel module
               tls is required.


  OTP-18253    Application(s): ssl

               With this change, TLS 1.3 server can be configured to
               include client certificate in session ticket.


  OTP-18254    Application(s): ssl
               Related Id(s): PR-5982

               With this change, it is possible to configure
               encryption seed to be used with TLS1.3 stateless
               tickets. This enables using tickets on different server
               instances.


  OTP-18312    Application(s): ssl

               Debugging enhancements.


  OTP-18335    Application(s): ssl

               With this change, maybe keyword atom is not used as
               function name in ssl code.


  OTP-18405    Application(s): crypto, diameter, kernel, ssl
               Related Id(s): GH-6672, PR-6700, PR-6702, PR-6768,
               PR-6769, PR-6812, PR-6814

               Replace size/1 with either tuple_size/1 or byte_size/1

               The size/1 BIF is not optimized by the JIT, and its use
               can result in worse types for Dialyzer.

               When one knows that the value being tested must be a
               tuple, tuple_size/1 should always be preferred.

               When one knows that the value being tested must be a
               binary, byte_size/1 should be preferred. However,
               byte_size/1 also accepts a bitstring (rounding up size
               to a whole number of bytes), so one must make sure that
               the call to byte_size/ is preceded by a call to
               is_binary/1 to ensure that bitstrings are rejected.
               Note that the compiler removes redundant calls to
               is_binary/1, so if one is not sure whether previous
               code had made sure that the argument is a binary, it
               does not harm to add an is_binary/1 test immediately
               before the call to byte_size/1.


  OTP-18438    Application(s): ssl
               Related Id(s): GH-6679

               *** POTENTIAL INCOMPATIBILITY ***

               For security reasons remove support for SHA1 and DSA
               algorithms from default values.


  OTP-18453    Application(s): ssl

               Mitigate memory usage from large certificate chains by
               lowering the maximum handshake size. This should not
               effect the common cases, if needed it can be configured
               to a higher value.


  OTP-18455    Application(s): ssl
               Related Id(s): GH-5899

               *** POTENTIAL INCOMPATIBILITY ***

               Change the client default verify option to verify_peer.
               Note that this makes it mandatory to also supply
               trusted CA certificates or explicitly set verify to
               verify_none. This also applies when using the so called
               anonymous test cipher suites defined in TLS versions
               pre TLS-1.3.


  OTP-18456    Application(s): kernel, ssl

               Erlang distribution code in Kernel and SSL has been
               refactored a bit to facilitate debugging and
               re-usability, which shouldn't have any noticeable
               effects on behaviour or performance.


  OTP-18459    Application(s): ssl

               *** HIGHLIGHT ***

               Add encoding and decoding of use_srtp hello extension
               to facilitate for DTLS users to implement SRTP
               functionality.


 Full runtime dependencies of ssl-11.0: crypto-5.0, erts-14.0,
 inets-5.10.7, kernel-9.0, public_key-1.11.3, runtime_tools-1.15.1,
 stdlib-4.1


 ---------------------------------------------------------------------
 --- stdlib-5.0 ------------------------------------------------------
 ---------------------------------------------------------------------

 --- Fixed Bugs and Malfunctions ---

  OTP-18275    Application(s): stdlib
               Related Id(s): PR-6045

               All process calls in dets have been updated to use the
               receive queue optimizations.


  OTP-18471    Application(s): kernel, stdlib
               Related Id(s): GH-6339, PR-6843

               *** POTENTIAL INCOMPATIBILITY ***

               proc_lib:start*/* has become synchronous when the
               started process fails. This requires that a failing
               process use a new function proc_lib:init_fail/2,3, or
               exits, to indicate failure. All OTP behaviours have
               been fixed to do this.

               All these start functions now consume the 'EXIT'
               message from a process link for all error returns.
               Previously it was only the start_link/* functions that
               did this, and only when the started function exited,
               not when it used init_ack/1,2 or init_fail/2,3 to
               create the return value.


  OTP-18486    Application(s): kernel, stdlib
               Related Id(s): PR-6881

               Fixed a bug where file:read(standard_io, ...)
               unexpectedly returned eof in binary mode.


 --- Improvements and New Features ---

  OTP-14835    Application(s): kernel, stdlib
               Related Id(s): PR-5924

               *** HIGHLIGHT ***

               The Erlang shell has been improved to support the
               following features:

               -- Auto-complete variables, record names, record field
               names, map keys, function parameter types and
               filenames.

               -- Open external editor in the shell (with C-o) to edit
               the current expression in an editor.

               -- Support defining records (with types), functions and
               function typespecs, and custom types in the shell.

               -- Do not save pager commands, and input to io:getline
               in history.


  OTP-15597    Application(s): stdlib
               Related Id(s): PR-5831

               Gen_server now caches external functions for use in
               handle_call, handle_cast and handle_info.


  OTP-17932    Application(s): erts, kernel, stdlib
               Related Id(s): GH-3150, GH-3390, GH-4225, GH-4343,
               PR-6144

               *** HIGHLIGHT ***

               The TTY/terminal subsystem has been rewritten from by
               moving more code to Erlang from the old linked-in
               driver and implementing all the I/O primitives needed
               in a NIF instead.

               On Unix platforms the user should not notice a lot of
               difference, besides better handling of unicode
               characters and fixing of some long standing bugs.

               Windows users will notice that erl.exe has the same
               functionality as a normal Unix shell and that werl.exe
               has been removed and replaced with a symlink to
               erl.exe. This makes the Windows Erlang terminal
               experience identical to that of Unix.

               The re-write brings with it a number of bug fixes and
               feature additions:

               -- The TTY is now reset when Erlang exits, fixing zsh
               to not break when terminating an Erlang session.

               -- standard_error now uses the same unicode mode as
               standard_io.

               -- Hitting backspace when searching the shell history
               with an empty search string no longer breaks the shell.

               -- Tab expansion now works on remote nodes started
               using the JCL interface.

               -- It is now possible to configure the shell slogan and
               the session slogans (that is the texts that appear when
               you start an Erlang shell). See the kernel
               documentation for more details.

               -- Added shell:start_interactive for starting the
               interactive shell from a non-interactive Erlang session
               (for example an escript).

               -- On Windows, when starting in detached mode the
               standard handler are now set to nul devices instead of
               being unset.


  OTP-18150    Application(s): stdlib

               Added codepoint category to unicode_util


  OTP-18159    Application(s): stdlib
               Related Id(s): PR-6904

               Added the zip:zip_get_crc32/2 function to retrieve the
               CRC32 checksum from an opened ZIP archive.


  OTP-18176    Application(s): stdlib
               Related Id(s): PR-6118

               Add the new options post_process_args and detached to
               peer:start function.


  OTP-18221    Application(s): stdlib
               Related Id(s): PR-6197

               The re:replace/3,4 functions now accept as the
               replacement argument.


  OTP-18228    Application(s): stdlib
               Related Id(s): GH-5639

               *** HIGHLIGHT ***

               The performance of the base64 module has been
               significantly improved. For example, on an x86_64
               system with the JIT both encode and decode are almost
               three times faster than in Erlang/OTP 25.


  OTP-18236    Application(s): stdlib
               Related Id(s): PR-6256

               Improved implementation of timer:apply_interval/4
               reducing load on the timer server, and introduction of
               the new function timer:apply_repeatedly/4.
               timer:apply_repeatedly/4 is similar to
               timer:apply_interval/4, but timer:apply_repeatedly/4
               prevents parallel execution of triggered apply
               operations which timer:apply_interval/4 does not.


  OTP-18247    Application(s): stdlib
               Related Id(s): PR-6280, PR-6711

               The base64 module now supports encoding and decoding
               with an alternate URL safe alphabet, and an option for
               accepting or adding missing = padding characters.


  OTP-18272    Application(s): stdlib
               Related Id(s): PR-6279

               Add shell:whereis/0 which can be used to locate the
               current shell process.


  OTP-18278    Application(s): kernel, stdlib
               Related Id(s): PR-6260

               *** HIGHLIGHT ***

               The Erlang shell's auto-completion when typing tab has
               been changed to happen after the editing current line
               instead of before it.

               This behaviour can be configured using a the
               shell_expand_location STDLIB configuration parameter.


  OTP-18279    Application(s): stdlib
               Related Id(s): PR-6234

               New function ets:lookup_element/4 with a Default
               argument returned if the key did not exist in the
               table. The old ets:lookup_element/3 raises a badarg
               exception which can be both inconveniente and slower.


  OTP-18285    Application(s): kernel, ssh, stdlib
               Related Id(s): PR-6262

               *** POTENTIAL INCOMPATIBILITY ***

               Typing Ctrl+L in a shell now clears the screen and
               redraws the current line instead of only redrawing the
               current line. To only redraw the current line, you must
               now type Alt+L. This brings the behaviour of Ctrl+L
               closer to how bash and other shells work.


  OTP-18287    Application(s): stdlib
               Related Id(s): PR-5955

               peer nodes using standard_io connections now include
               standard error from the node in the io stream from the
               started node.


  OTP-18297    Application(s): compiler, stdlib
               Related Id(s): GH-6348

               *** HIGHLIGHT ***

               A limitation in the binary syntax has been removed. It
               is now possible to match binary patterns in parallel.
               Example: <<A:8>> = <<B:4,C:4>> = Bin


  OTP-18301    Application(s): stdlib
               Related Id(s): PR-6350

               Improve type specification of
               unicode:characters_to_list().


  OTP-18318    Application(s): stdlib
               Related Id(s): PR-6347

               *** HIGHLIGHT ***

               In the lists, the zip family of functions now takes
               options to allow handling lists of different lengths.


  OTP-18337    Application(s): compiler, stdlib
               Related Id(s): GH-6477, PR-6503

               It is documented that $\^X is the ASCII code for
               Control X, where X is an uppercase or lowercase letter.
               However, this notation would work for any character X,
               even then it didn't make sense.

               In Erlang/OTP 26, it is now documented that the
               following characters are also allowed to follow the \^
               characters: @, [, \, ], ^, _, and ?. Attempt to use
               other characters will be rejected with a compiler
               error.

               The value for $\^? is now 127 (instead of 31 as in
               earlier releases).


  OTP-18354    Application(s): stdlib
               Related Id(s): PR-6297

               The binary:encode_hex/2 function has been added to
               allow the encoded hexadecimal digits to be in either
               lower or upper case.


  OTP-18355    Application(s): stdlib
               Related Id(s): PR-6507

               Variants of timer:tc() with user specified time unit
               have been introduced.


  OTP-18361    Application(s): stdlib
               Related Id(s): PR-6536

               New function math:tau/0. Returns 2*math:pi().


  OTP-18367    Application(s): compiler, erts, stdlib
               Related Id(s): GH-6544

               *** HIGHLIGHT ***

               The BIFs min/2 and max/2 are now allowed to be used in
               guards and match specs.


  OTP-18385    Application(s): stdlib
               Related Id(s): PR-6698

               Optimized gen_server:multi_call().


  OTP-18413    Application(s): compiler, erts, stdlib, syntax_tools,
               tools
               Related Id(s): EEP-58, PR-6727

               *** HIGHLIGHT ***

               Map comprehensions as suggested in EEP 58 has now been
               implemented.


  OTP-18414    Application(s): erts, stdlib
               Related Id(s): PR-6151

               *** HIGHLIGHT ***

               Some map operations have been optimized by changing the
               internal sort order of atom keys. This changes the
               (undocumented) order of how atom keys in small maps are
               printed and returned by maps:to_list/1 and maps:next/1.
               The new order is unpredictable and may change between
               different invocations of the Erlang VM.

               For applications where order is important, there is a
               new function maps:iterator/2 for creating iterators
               that return the map elements in a deterministic order.
               There are also new modifiers k and K for the format
               string for io:format() to support printing map elements
               ordered.


  OTP-18423    Application(s): stdlib
               Related Id(s): com/erlang/backlog/issues/142,
               https://github

               Make gen_server fail "silently" with a new return value
               for init/1.


  OTP-18431    Application(s): compiler, stdlib
               Related Id(s): PR-6739

               *** HIGHLIGHT ***

               Improved the selective receive optimization, which can
               now be enabled for references returned from other
               functions.

               This greatly improves the performance of
               gen_server:send_request/3, gen_server:wait_response/2,
               and similar functions.


  OTP-18445    Application(s): erts, stdlib

               *** HIGHLIGHT ***

               It is no longer necessary to enable a feature in the
               runtime system in order to load modules that are using
               it. It is sufficient to enable the feature in the
               compiler when compiling it.

               That means that to use feature maybe_expr in Erlang/OTP
               26, it is sufficient to enable it during compilation.

               In Erlang/OTP 27, feature maybe_expr will be enabled by
               default, but it will be possible to disable it.


  OTP-18474    Application(s): stdlib
               Related Id(s): PR-6895

               Static supervisors are very idle processes after they
               have started so they will now be hibernated after start
               to improve resource management.


  OTP-18494    Application(s): stdlib
               Related Id(s): PR-6924

               Support has been added in ms_transform for the actions
               caller_line/0, current_stacktrace/0, and
               current_stacktrace/1.


  OTP-18495    Application(s): stdlib
               Related Id(s): PR-6943

               *** HIGHLIGHT ***

               The family of enumeration functions in module lists has
               been extended with enumerate/3 that allows a step value
               to be supplied.


  OTP-18500    Application(s): stdlib

               *** HIGHLIGHT ***

               Update Unicode to version 15.0.0.


  OTP-18511    Application(s): otp, stdlib
               Related Id(s): PR-7017

               The regular expression library powering the re module
               is likely to be changed in Erlang/OTP 27. See Upcoming
               Potential Incompatibilities.


  OTP-18515    Application(s): stdlib
               Related Id(s): GH-6990

               Improved the performance of sets:subtract/2 when
               subtracting a small number of elements.


  OTP-18518    Application(s): stdlib
               Related Id(s): GH-7015

               The linter will no longer raise warnings for
               underspecified opaque types.


  OTP-18522    Application(s): dialyzer, erts, stdlib

               *** HIGHLIGHT ***

               Added the new built-in type dynamic() introduced in
               EEP-61, improving support for gradual type checkers.


 Full runtime dependencies of stdlib-5.0: compiler-5.0, crypto-4.5,
 erts-13.1, kernel-9.0, sasl-3.0


 ---------------------------------------------------------------------
 --- syntax_tools-3.1 ------------------------------------------------
 ---------------------------------------------------------------------

 --- Improvements and New Features ---

  OTP-18413    Application(s): compiler, erts, stdlib, syntax_tools,
               tools
               Related Id(s): EEP-58, PR-6727

               *** HIGHLIGHT ***

               Map comprehensions as suggested in EEP 58 has now been
               implemented.


 Full runtime dependencies of syntax_tools-3.1: compiler-7.0,
 erts-9.0, kernel-5.0, stdlib-4.0


 ---------------------------------------------------------------------
 --- tftp-1.1 --------------------------------------------------------
 ---------------------------------------------------------------------

 --- Improvements and New Features ---

  OTP-18490    Application(s): diameter, inets, mnesia, reltool,
               snmp, ssh, tftp, wx
               Related Id(s): GH-6339, OTP-18471, PR-6843

               *** POTENTIAL INCOMPATIBILITY ***

               The implementation has been fixed to use
               proc_lib:init_fail/2,3 where appropriate, instead of
               proc_lib:init_ack/1,2.


 Full runtime dependencies of tftp-1.1: erts-6.0, kernel-6.0,
 stdlib-5.0


 ---------------------------------------------------------------------
 --- tools-3.6 -------------------------------------------------------
 ---------------------------------------------------------------------

 --- Improvements and New Features ---

  OTP-18413    Application(s): compiler, erts, stdlib, syntax_tools,
               tools
               Related Id(s): EEP-58, PR-6727

               *** HIGHLIGHT ***

               Map comprehensions as suggested in EEP 58 has now been
               implemented.


  OTP-18487    Application(s): runtime_tools, tools
               Related Id(s): PR-6829

               The instrument module has been moved from tools to
               runtime_tools.


 Full runtime dependencies of tools-3.6: compiler-5.0, erts-11.0,
 erts-9.1, kernel-5.4, runtime_tools-1.8.14, stdlib-3.4


 ---------------------------------------------------------------------
 --- wx-2.3 ----------------------------------------------------------
 ---------------------------------------------------------------------

 --- Improvements and New Features ---

  OTP-18350    Application(s): inets, observer, os_mon, reltool, wx

               Runtime dependencies have been updated.


  OTP-18490    Application(s): diameter, inets, mnesia, reltool,
               snmp, ssh, tftp, wx
               Related Id(s): GH-6339, OTP-18471, PR-6843

               *** POTENTIAL INCOMPATIBILITY ***

               The implementation has been fixed to use
               proc_lib:init_fail/2,3 where appropriate, instead of
               proc_lib:init_ack/1,2.


 Full runtime dependencies of wx-2.3: erts-12.0, kernel-8.0,
 stdlib-5.0


 ---------------------------------------------------------------------
 ---------------------------------------------------------------------
 ---------------------------------------------------------------------