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For Rst = A1 * A2, typesig for erlang:'*'/2 was constraining the
arguments A1 and A2 in the 'reverse' direction by requiring that A2 is a
subtype of Rst div A1, unless A1 is a hard zero. This is not correct: if
for example both Rst and A1 are non_negative, such a constraint will
first force A1 to be non-zero for the division to go through and then
require A2 to be non_negative as non_negative div positive =
non_negative, always (see commited test).
In the fixed version, we are not constraining an argument if the other
operand *may* be zero.
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