https://bugs.python.org/review/5784/diff/14652/Doc/library/zlib.rst File Doc/library/zlib.rst (right): https://bugs.python.org/review/5784/diff/14652/Doc/library/zlib.rst#newcode8... Doc/library/zlib.rst:84: * -8 to -15: Uses the absolute value of *wbits* as the window size, while absolute value . . . as the logarithm https://bugs.python.org/review/5784/diff/14652/Doc/library/zlib.rst#newcode8... Doc/library/zlib.rst:88: the window size, while including a basic :program:`gzip` header as the logarithm https://bugs.python.org/review/5784/diff/14652/Doc/library/zlib.rst#newcode1... Doc/library/zlib.rst:143: :func:`compressobj`. When decompressing a stream, *wbits* must not be the history buffer size must not be smaller [According to the zlib inflateInit2() documentation, for the negative case it is the magnitude that cannot be smaller, which makes more sense than the alternative.] https://bugs.python.org/review/5784/