[issue17694] Enhance _PyUnicodeWriter API to control minimum buffer length without overallocation

[STINNER Victor]

STINNER Victor added the comment:

PyUnicode_DecodeUnicodeEscape() should set writer.min_length instead of using _PyUnicodeWriter_Prepare(), but the following assertion fails (because writer.size is zero by default):

        assert(writer.pos < writer.size || (writer.pos == writer.size && c == '\n'));

I don't understand this assertion, so I don't know how to modify it.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17694>
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