[scottlamb]

Apparently precompressor is a general term [1] that applies here:

> A precompressor is a computer program, which alters file content so that a real lossless compression program will achieve better results than without precompressing. This is possible by creating such patterns that compression programs will recognize.

In this case the altered content is (quoting the README) "decompressed data from the original file together with reconstruction data"). So confusingly enough its precompressing includes decompressing.

I don't think "precomp" is a real accurate name for the whole tool, but that might be where it came from.

With no flags it will precompress (including decompressing) and compress. With -cn, it will precompress alone. With -r, it will decompress and...I dunno, postcompress (including compressing)?

[1] https://findwords.info/term/precompressor