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[Python-Dev] Unexpected bytecode difference

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I have encountered the following difference between Python 3 and 2:

(py3)
>>> compile('xxx', '<>', 'eval').co_code
b'e\x00S\x00'

(py2)
>>> compile('xxx', '<>', 'eval').co_code
'e\x00\x00S'

Note that 'S' (the code for RETURN_VALUE) and a zero byte are swapped
in Python 2 compared to Python 3.  Is this change documented
somewhere?

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