Eric Smith added the comment:
It looks like PyUnicode_FromFormatV is computing callcount incorrectly.
It's looking for 'S', 'R', or 'A' immediately following '%', before the
width. It seems to me it should be treating them the same as 's',
although I'll admit to not having looked at it close eno
New submission from Mark Dickinson :
There seems to be something wrong with the width handling code in
PyUnicode_FromFormat; or perhaps I'm misusing it.
To reproduce: replace the line
return PyUnicode_FromFormat("range(%R, %R)", r->start, r->stop);
in range_repr in Objects/rangeobject.c
