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Use eval_type_backport on Python 3.9 if it's installed to resolve int | None etc. #773

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Use eval_type_backport on Python 3.9 if it's installed to resolve int | None etc. #773

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Commits on Nov 16, 2024

  1. Use eval_type_backport on Python 3.9 if it's installed to resolve `in… 

    …t | None` etc.

This uses the same module that pydantic does, and it allows people to use the
new pipe syntax if they have to support Python3.9 too -- very useful for
libraries.

(Also it works better with many type checkers which seem to mistakenly think
that with `from __future__ import annotations` means `int| None` will work,
but it doesn't out of the box.)
    @ashb
    ashb committed Nov 16, 2024
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