[issue17159] Remove explicit type check from inspect.Signature.from_function()

[Yury Selivanov]

Changes by Yury Selivanov <yselivanov.ml at gmail.com>:


Removed file: http://bugs.python.org/file33836/sig_func_ducktype_03.patch

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17159>
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