:   '''zlib gunzip''' ''data'' ?'''-headerVar''' ''varName''?
This command, part of [zlib], takes the gzip-format compressed bytearray ''data'' and returns its uncompressed version.
The optionally specified '''-headerVar''' option gives the name of a variable in which to store a [dict] that contains the contents of the gzip header. The following keys are defined:
   '''comment''':   The comment field.
   '''crc''':   Whether a CRC of the header was computed.
   '''filename''':   The name of the file that was compressed.
   '''os''':   The originating operating system code, if not the unknown value. Codes are described in [RFC] 1952.
   '''size''':   The size of the uncompressed data, in bytes modulo 2³².
   '''time''':   The modification time of the file (as in [file mtime]) in seconds from the Unix epoch (as in [clock seconds]).
   '''type''':   Either '''text''' or '''binary''', giving the estimated type of the contained data.


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