[issue19646] Use PyUnicodeWriter in repr(dict)

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

> Using this function, there is no need to create temporary colon (": ") or sep (", ") strings, performances are a little better with the final commit.

I'm surprised that this has given such large effect. ;) I hoped only on more clear code.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue19646>
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