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PKWARE added zstd compression method to zip specification, originally was pushed and supported only by WinZip Pro. Compression level limited by 9 (libzip limitation) but zstd itself supports up to 22 (without using --ultra methods), see https://github.com/nih-at/libzip/issues/214 But ark doesn't support different compression levels for different compression methods either. See also: https://pkware.cachefly.net/webdocs/casestudies/APPNOTE.TXT 93 - Zstandard (zstd) Compression !15
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