Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:
Possible solution: add an ordered subtype of frozenset which would keep an
array of items in the original order. The compiler only creates frozenset when
optimizes "x in {1, 2}" or "for x in {1, 2}". It should now create an ordered
frozenset from a list of constants (removing possible duplicates). The marshal
module should save items in that order and restore ordered frozensets when load
data. It should not increase memory consumption too much, because frozenset
constants in code are rare and small.
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nosy: +serhiy.storchaka
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue37596>
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