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

[Antoine Pitrou]

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

> >> When it's possible to not overallocate, the speed up is around 10% for
> >> short strings (I suppose that it's much better to longer strings).
> > Well, please post a benchmark for long strings, then :-)
> 
> Ok, here you have. I don't understand why results are so random. There
> is no performance regression, but there are interesting speed up.

Do you have anything more interesting than fmt="%s" ?

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