i compress with masks for about 8 9 months this method to me is known to some time 
it took me 5 months to optimize this with tests and i got membership in this site in octomber :P
making something for example xz took me a lot good that it works btw
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My projects : Masked Compression, lzma2(xz) on Freearc, Zstd compressor for windows
My optimizations : packjpg.exe, zstd, lzham, precomp-dev-0.45.
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