Martin Panter added the comment:

Here is a patch with the following changes:

* Clarified that wbits affects the container format as well as windows size
* Undid some word wrapping to make the diff simpler
* Added zero and 32 + n for decompression
* Added full list of options under decompressobj(), and link decompress() to 
that. Otherwise we end up saying decompression generates a header, when it 
really parses the header.
* Added tests for various wbits values
* Compressing with window bits = 8 not actually supported (Zlib bumps it to 9: 
<https://github.com/madler/zlib/commit/8e34b3a#diff-8940271ef2146523af486ca4408361daR264>.
 The change log says “Force windowBits > 8 to avoid a bug in the encoder for a 
window size of 256 bytes”.)
* Updated doc strings

----------
keywords: +patch
versions: +Python 3.5, Python 3.6 -Python 3.2, Python 3.3
Added file: http://bugs.python.org/file41187/zlib-wbits.v3.patch

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<http://bugs.python.org/issue5784>
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