[issue14744] Use _PyUnicodeWriter API in str.format() internals

[Antoine Pitrou]

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

> I will rewrite my format_writer-2.patch based on
> dont_overallocate.patch. It looks like you are waiting for the full
> patch.

Well, there's no point in committing the first patch if the second one
doesn't give an interesting speedup.

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