:   '''zlib stream''' ''mode'' ?''level''?
This command, part of [zlib], creates a streaming compression or decompression command, allowing greater control over the compression/decompression process. It returns the name of the stream instance command. The mode must be one of '''compress''', '''decompress''', '''deflate''', '''inflate''', '''gzip''', '''gunzip'''. The optional ''level'', which is only valid for compressing streams, gives the compression level from 0 (none) to 9 (max).

The returned ''streamInst'' command will support the following subcommands:
    :    ''streamInst'' '''add''' ?''option''? ''data''
    :    ''streamInst'' '''checksum'''
    :    ''streamInst'' '''close'''
    :    ''streamInst'' '''eof'''
    :    ''streamInst'' '''finalize'''
    :    ''streamInst'' '''flush'''
    :    ''streamInst'' '''fullflush'''
    :    ''streamInst'' '''get''' ?''count''?
    :    ''streamInst'' '''put''' ?''option''? ''data''
    :    ''streamInst'' '''reset'''
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