Benjamin Peterson <benja...@python.org> added the comment:

2011/4/1 Raymond Hettinger <rep...@bugs.python.org>:
> [benjamin]
> The __length_hint__ protocol is a public API, so anyone can use it.  Also, 
> the issue is a broader than __length_hint__, it is really distinguishing 
> multiple possible meanings for a TypeError raised by a call to __len__.

What?? I certainly hope not. I thought it was supposed to be a performance hack.

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<http://bugs.python.org/issue11674>
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