[issue29377] Add the 'wrapper_descriptor' type to the types module

[Manuel Krebber]

Manuel Krebber added the comment:

I added some docs, but I am not sure what I would want to test here. There are no tests for types.BuiltinMethodType either. Maybe the string representation of it could be tested, but an isinstance test seems pretty redundant. I hope this patch file works better, I created the last one with git diff.

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Added file: http://bugs.python.org/file46425/slot-wrapper-types.patch

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