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Fix: narrow zstd compression level to the conventional -22..22 range

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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.
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stumpylog
2026-07-23 15:42:57 -07:00
parent e3d8bcb102
commit 5d0fb476cf
4 changed files with 14 additions and 3 deletions
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docs/administration.md
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@@ -338,7 +338,7 @@ value set in `-zn` or `--zip-name`.
The compression method for the zip can be set with `--zip-compression`
(`stored`, `deflated` (default), `bzip2`, `lzma`, or `zstd`) and tuned with
`--zip-compression-level` (deflated: 0–9, bzip2: 1–9, zstd: -131072–22; ignored
`--zip-compression-level` (deflated: 0–9, bzip2: 1–9, zstd: -22–22; ignored
for `stored` and `lzma`). Both options require `--zip`.
!!! warning