Oh, interesting. The documentation there also says > They have become less important now that the built-in dict class gained the ability to remember insertion

Oh, interesting. The documentation there also says > They have become less important now that the built-in dict class gained the ability to remember insertion order (this new behavior became guaranteed in Python 3.7). https://docs.python.org/3/library/collections.html#ordereddict-objects https://docs.python.org/3/library/collections.html#ordereddi... It assumes iterators are stable (and valid) under insertion, and I can't find any docs on that for either. Since you (AFAIK) can't create an iterator at a specific key, we also couldn't use keys as the "hand."