Armin Rigo added the comment: (B2) fcntl.ioctl(x, y, buf, mutate_flag): mutate_flag is there for the case of buf being a read-write buffer, which is then mutated in-place. But if we call with a read-only buffer, mutate_flag is ignored (instead of rejecting a True value)---ioctl(x, y, "foo", True) will not actually mutate the string "foo", but the True is completely ignored. (I think this is a bug introduced during the Argument Clinic refactoring.)
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