[issue14205] Raise an error if a dict is modified during a lookup

[Guido van Rossum]

Guido van Rossum <guido at python.org> added the comment:

I'm still torn.  Can you implement the counter without adding an extra field to the dict object?  I worry that we'll get the same objection we had when MAL proposed collision counting as a solution to the hash DoS attack.

The numbers 0, 1 and infinity are special; all others are to be treated with skepticism.

I'm prepared to make the current semantic change a 3.3 feature, but I'm not sure it's safe to backport.

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