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Yes, accumulating the data will be backward-compatible.
But what if add a special flag for zlib.decompress, which makes bz2 and lzma compatible decoder? I.e.:
1) unconsumed_tail is always empty (the unconsumed data accumulated in internal buffer, no need manually add it to next chunk of data). Or even non-existent.
2) EOFError raised if decompress() is called after end-of-stream is reached.
Of course, it is a new feature.