Ezio Melotti added the comment:

Not sure this is a good idea.  The fact that CPython knows the width is an 
implementation detail.  The method you suggested might not be too fast but it 
works, so we would be adding a new function/method just to optimize a fairly 
uncommon operation that depends on an implementation detail.

----------
components: +Unicode
nosy: +ezio.melotti, haypo, loewis
type:  -> enhancement

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<http://bugs.python.org/issue17629>
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