Motivation:
Since the LZF support non-compress and compress format, we can let LzfEncoder support length aware ability. It can let the user control compress.
Modification:
When the data length over compressThreshold, LzfEncoder use compress format to compress data. Otherwise, only use non-compress format. Whatever compress format the encoder use, the LzfDecoder can decompress data well.
Result:
Gives users control over compression capabilities
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