[issue5784] raw deflate format and zlib module

[paul rubin]

paul rubin <phr at users.sourceforge.net> added the comment:

I should have mentioned, the docs do say "When wbits is negative, the
standard gzip header is suppressed; this is an undocumented feature of
the zlib library, used for compatibility with unzip‘s compression file
format" but this wasn't enough at the time to figure out the issue.  I
suggest adding something like "and the 'raw deflate' format supported by
PHP and some web browsers.  

I better see if I can research the exact situation a bit further, for
the sake of documenting it accurately, if others here think it's a good
idea.

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