Armin Rigo added the comment:
Hi Raymond! Yes, I had the same reaction at first, but then it seemed to be
possible to implement a reasonably good behavior with almost no performance hit.
Plainly undefined behaviors are a mess for other implementations because in
half of the big projects people don't realize they depend on it at some place
--- particularly if the behavior is "mostly sane", as it seems to be right now
for OrderedDict.
For example, I believe the following code to always work:
for key in ordered_dict:
if some_condition:
del ordered_dict[key]
whereas it always raise RuntimeError with regular dicts, which are both ok
choices. But silently not working would be much worse.
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<http://bugs.python.org/issue19414>
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