ByteBaker commented on issue #6282:
URL: https://github.com/apache/arrow-rs/issues/6282#issuecomment-2368839224

   @JakkuSakura After discussing with `flate2` maintainers, I've confirmed that 
it's actually a documentation issue, but there's a slight caveat as well. 
`flate2` supports both `miniz` and `zlib` backends, the former enabled by 
default.
   
   For consistency, the documentation states the compression range as `0-9`, 
but 10 is supported by default. If the backend is switched to `zlib`, then an 
attempt to use a compression level 10 will cause a panic.
   
   I've opened a [pull request in 
flate2](https://github.com/rust-lang/flate2-rs/pull/427) to explicitly mention 
this in the docs, so that there's no confusion around this behavior. I hope 
this resolves your query?


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