[Zope] odd iteration semantics in ZPT

[dman]

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I created a collection and iterator class in an External Method for
use by my web app.  I implmented the iterator protocol introduced by
python 2.2, but also included a __getitem__ method to provide the
"old" iteration mechanism.  For various reasons, the client of my
iterator needs to know some information regarding where in the
iteration process the iterator is at.

I had little trouble making the iterator itself, but I kept getting
odd assertion errors and minor defects in the way data was retrieved
from my iterator.  I managed to track it down to the fact that
__getitem__ is called twice with 0 as the index.  The sequence of
index values looks like :  [0, 0, 1, 2, 3, 4, 5, 6, 7, 8]
I can work around this anomaly by resetting my iterator every time the
index is 0.

Is this a bug in zope?  (I expect that the bug is in ZTUtils/Iterator.py)

I'm using zope 2.5.1, python 2.1.3, debian 3.0.

-D

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