Josh Rosenberg <shadowranger+pyt...@gmail.com> added the comment:

This would presumably be a side-effect of all generic pickling operations of 
iterators; figuring out what the iterator produces requires running out the 
iterator. You could special case it case-by-case, but that just makes the 
behavior unreliable/confusing; now some iterators pickle without being mutated, 
and others don't. Do you have a proposal to fix it? Is it something that needs 
to be fixed at all, when the option to pickle the original OrderedDict directly 
is there?

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nosy: +josh.r

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue34574>
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