[issue7330] PyUnicode_FromFormat: implement width and precision for %s, %S, %R, %V, %U, %A

[STINNER Victor]

STINNER Victor added the comment:

I didn't add the following optimization (proposed by Serhiy in his review) 
because I'm not convinced that it's faster, and it's unrelated to this issue:

   if (width > (PY_SSIZE_T_MAX - 9) / 10
       && width > (PY_SSIZE_T_MAX - ((int)*f - '0')) / 10)
   { ... }

instead of 

   if (width > (PY_SSIZE_T_MAX - ((int)*f - '0')) / 10)
   { ... }

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