[issue8923] Remove unused "errors" argument from _PyUnicode_AsDefaultEncodedString()

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

> Since Python3 fixes the UTF-8 default encoding, it's better
> to enhance PyUnicode_AsUTF8String() to cache the UTF-8
> string in the Unicode object

Right, that sounds like a great idea. Attached patch implements that: patch PyUnicode_AsUTF8String() and PyUnicode_AsEncodedString(). Does it look ok?

> replace all uses of _PyUnicode_AsDefaultEncodedString() 
> with PyUnicode_AsUTF8String()

I'm waiting for your approval of the first patch before working on the second part.

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Added file: http://bugs.python.org/file17595/utf8_defenc.patch

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<http://bugs.python.org/issue8923>
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