[docs] [issue13538] Docstring of str() and/or behavior

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> Personally I'm not at all sure why str takes encoding and errors
> arguments (I never use them).

Probably because the unicode type also did in 2.x.
And also because it makes it compatible with arbitrary buffer objects:

>>> str(memoryview(b"foo"), "ascii")
'foo'

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nosy: +pitrou

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