[issue36551] Optimize list comprehensions with preallocate size and protect against overflow

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

We can return to this issue if make the invocation of __length_hint__ much much faster. For example by adding the tp_length_hint slot. But currently it is too large change and his has negative effects.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36551>
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