> I believe the reason for immutable *args is one of optimization. I think there is also a correctness issue at work. For an immutable argument tuple, you can be sure that the tuple won't change "behind you". That, in turn, means that PyArg_ParseTuple can return borrowed references, so that C functions don't have to decref the arguments the have fetched. If the argument tuple was mutable, that would be much more risky.
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