Issue #1218234. Initial patch by Berker Peksag.

Patch by Févry Thibault.

Closes #21801.

Patch by Jeremiah Lowin. Closes #20817.

... for missing keyword-only arguments. Patch by Jeremiah Lowin.
Closes #20816.

Initial patch by Nick Coghlan.

Initial patch by Nick Coghlan.

The new syntax is highly human readable while still preventing false
positives.  The syntax also extends Python syntax to denote "self" and
positional-only parameters, allowing inspect.Signature objects to be
totally accurate for all supported builtins in Python 3.4.

attribute, that attribute is an instance of 'functools.partialmethod'.

of name conflict between '__bind_self' and actual keyword argument to
'bind' or 'bind_partial'.

be provided #20422

Initial patch by Yann Kaiser (epsy).

annotate text signatures in docstrings, resulting in fewer false
positives.  "self" parameters are also explicitly marked, allowing
inspect.Signature() to authoritatively detect (and skip) said parameters.

Issue #20326: Argument Clinic now generates separate checksums for the
input and output sections of the block, allowing external tools to verify
that the input has not changed (and thus the output is not out-of-date).

the rest in Signature.__str__. #20356

Some classes defined in C may not have the '__module__' attribute, so
we now handle this case to avoid having unexepected AttributeError.

PyMethodDescr_Type, _PyMethodWrapper_Type, and PyWrapperDescr_Type)
have been modified to provide introspection information for builtins.
Also: many additional Lib, test suite, and Argument Clinic fixes.