Joe Jevnik added the comment: CALL_FUNCTION doesn't use extended arg; I don't see what we get by adding some opcode to convert the sequence into a tuple. We also don't want to box up the stack arguments into a tuple because when we do a CALL_FUNCTION to a python function we just copy the stack[-n:] elements into the locals of the next frame. Emitting a build_tuple here would be an unneeded allocation.
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