[issue29286] Use METH_FASTCALL in str methods

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Oh, I have wrote almost the same patch before going to sleep yesteday! ;)  But the building crashed (likely due to a bug in _PyStack_UnpackDict()) and it was too late to resolve this.

I would prefer to rename "l" to "nargs" in PyArg_UnpackStack_impl and don't use upper case and namespace prefix in static functions.

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<http://bugs.python.org/issue29286>
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