[issue24248] Deprecate inspect.Signature.from_function and from_builtin

[Nick Coghlan]

Nick Coghlan added the comment:

+1 from me.

The deprecation warning text in the patch has a typo (callback instead of callable).

For the documentation, in addition to noting the deprecation itself, it may also be worth noting how to explicitly recreate the type restriction.

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<http://bugs.python.org/issue24248>
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