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ZTSD limits the safe compression level to a max of 19 as 20 to 22 cause increased RAM usage. Higher levels require --ultra arg passed. There isn't currently a way to set --ultra using ENV options similar to ZSTD_CLEVEL and ZSTD_CLEVEL is limited to 19. To fix this, we can increase the max safe compression level by providing a custom ZSTDCLI_CLEVEL_MAX value with CFLAGS. The max safe level is increased to 20. Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>