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The raw library bounds (-131072, 22) come from an internal zstd implementation constant (-ZSTD_TARGETLENGTH_MAX), not a meaningful distinct level — deeper negative values than -22 buy nothing over -22 in practice, and the zstd CLI/community convention only uses -22..22. Exposing the raw range via --zip-compression-level would let a user pass a number like -50000 that "validates" but means nothing.