[issue19513] Use PyUnicodeWriter instead of PyAccu in repr(tuple) and repr(list)

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

You shouldn't cache Py_SIZE(v) because it can be changed during iteration.

Due to benchmark results in issue15381 I afraid this patch will be much slower on Windows.

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<http://bugs.python.org/issue19513>
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