[issue21667] Clarify status of O(1) indexing semantics of str objects

[Antoine Pitrou]

Antoine Pitrou added the comment:

Not sure what implementing a conformant Python implementation has to do with this; the language specification should be readable by any interested programmers, IMO.

> If you try to dive into the formal Unicode spec instead, you end up
> in a twisty maze of definitions of things that are all closely 
> related, but generally not the same thing (code positions, code units, 
> code spaces, abstract characters, glyphs, graphemes, etc).

That makes all the less useful to use the "proper term" instead of the more intuitive alternative :-)

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<http://bugs.python.org/issue21667>
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