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

[STINNER Victor]

STINNER Victor <victor.stinner at gmail.com> added the comment:

> So far away I have to say, it is better to use stringlib
> approach, than the massive macros, which are more difficult
> to read and edit.

Ah, you don't like the two macros in longobject.c. Functions to write digits into a string may be appropriate in the stringlib.

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