> While we are here, it is possible to add the support of general byte-like objects.

With and without the patch, write() accepts bytes, bytearray and memoryview. Which other byte-like types do you know?

writeframesraw() method of aifc, sunau and wave modules use this pattern:

    if not isinstance(data, (bytes, bytearray)):
        data = memoryview(data).cast('B')

We can maybe reuse it in gzip module?