Serhiy Storchaka added the comment:

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.

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nosy: +serhiy.storchaka

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue16350>
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