Alex Gaynor <alex.gay...@gmail.com> added the comment: Amaury points out: this is not strictly about immutable objects, but rather objects who's deepcopy is themselves (identity-wise), in some (rare I think) cases this could provide a slowdown. Specifically a case of [(1, 2, 3)] * 10000 would be slower, because it would review each tuple individually, rather than using the memo'd instance. I suspect this case is not so common (to have the same identity object, who's deepcopy is itself such as a tuple or object with custom __deepcopy__, many times in a deepcopy object graph), but I have no proof of this.
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