[Python-3000] Builtin iterator type

[Fredrik Lundh]

George Sakkis wrote:

>> (and I completely disagree that Mike's observation is moot: consistency
>> is a fundamental part of Python's design, and mechanisms that helps
>> people keep their code consistent without even noticing is an important
>> part of why things are that way.)
> 
> Striving for consistency without enforcing interfaces seems self defeating.

seems to, perhaps, but Python's been around for a quite some time by 
now.  if the approach didn't work, we'd probably noticed by now.

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