[issue45455] Fill func.__doc__ lazily

[Serhiy Storchaka]

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

BTW, I think that we spent on issue36521 much more time (especially your time, Inada-san) than it deserved. In normal case 3~5% would look not impressive. But I do not see any immediate drawbacks of making this change, and I afraid that if we do not make it now we will spend more time on discussing issue36521 and related ideas.

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<https://bugs.python.org/issue45455>
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