+1 for not adding in-pickle compression as it is already very easy to handle compression externally (for instance by passing a compressing file object as an argument to the pickler). Furthermore, as PEP 574 makes it possible to stream the buffer bytes directly to the file-object without any temporary memory copy I don't see any benefit in including the compression into the pickle protocol.
However adding lz4.LZ4File to the standard library in addition to gzip.GzipFile and lzma.LZMAFile is probably a good idea as LZ4 is really fast compared to zlib/gzip. But this is not related to PEP 574. -- Olivier
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