Compressor: return Cow<[u8]> for zero-copy passthrough #220
Description
Change `compress(&[u8]) -> Vec` to `-> Cow<[u8]>` so passthrough compressor avoids allocation.
Breaking: trait signature change.
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Change `compress(&[u8]) -> Vec` to `-> Cow<[u8]>` so passthrough compressor avoids allocation.
Breaking: trait signature change.