Serhiy Storchaka added the comment: The pair LOAD_CONST/RETURN_VALUE is on 19th place of the top of opcode pairs (see msg269391 in issue27255). Not all of these constants are None. And since the time of LOAD_CONST is much smaller then the time of RETURN_VALUE (the latter includes destroying a frame and should be in a pair with CALL_FUNCTION), I think the performance effect of RETURN_NONE is much less than 1%.
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