Level is the compression level to use. It must be set to between -1 and 9, with -1 causing the compressor to use the default compression level, 0 causing the compressor to use no compression and 1 to 9 representing increasing (better, slower) compression levels. If Level is less than -1 or more then 9, a non-nil error will be returned during encryption. See the constants above for convenient common settings for Level.
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