:   '''zlib gzip''' ''data'' ?'''-level''' ''level''? ?'''-header''' ''dict''?
This command, part of [zlib], takes the bytearray ''data'' and returns its gzip-format compressed version.
The '''-level''' option gives the compression level, which may be any value from 0 (uncompressed) to 9 (maximally, most slowly compressed).
The '''-header''' option gives a [dict] that describes how to set up the gzip header. The following keys are used:
   '''comment''':   A comment string. Will be encoded as an [ISO] 8859-1 string.
   '''crc''':   Whether to calculate a CRC of the header. Note that the [gzip] utility program does ''not'' handle header CRCs.
   '''filename''':   The name of the original file. Will be encoded as an [ISO] 8859-1 string.
   '''os''':   The integer operating system code. The value should be one of those described in [RFC] 1952.
   '''time''':   The [file mtime%|%mtime%|%] of the originating file.
   '''type''':   The (guessed) type of the file, either '''text''' or '''binary'''.
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%| [Category Command] | [Category Compression] |%
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