I agree with Eric. While I understand what Serhiy is saying about code objects being more than a bytearray of bytecode, the buffer protocol is still a view on an object, and that view happens to be for a subset which I think is acceptable as I think of what a buffer of a code object would be other than the bytecode.

I also think read-only is a good enough guarantee. We're talking low-level stuff here and if anyone were to muck with this stuff they are already playing with fire.