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The following code displays "Xbc" using io, and "bc" using _pyio (or an unbuffered file, e.g. io.FileIO):
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import _pyio, io
with io.BytesIO(b'abc') as raw:
 #with _pyio.BufferedRandom(raw) as f:
 with io.BufferedRandom(raw) as f:
 f.write(b"X")
 print("pos?", f.tell(), raw.tell())
 print(f.read())
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I expect .write() to change the file position, and so "bc" must be the correct result, not "Wbc".
_pyio.BufferedRandom overrides its write method, whereas io.BufferedRandom doesn't.
I already noticed the implement difference of BufferedRandom.write(), but I don't remember if I reported it or not!?