Because zip compression programs can use different levels of compression
there is certainly no expectation that zipping the same file with different
compression levels will give the the same output. It MIGHT - but it's not
to be expected or relied upon. The only thing that's "guaranteed" is
I saw that change when reading the Changelog and I thought it doesn't
affect me,
as ZIP format doesn't necessarily involve compression:
https://pkware.cachefly.net/webdocs/casestudies/APPNOTE.TXT
> 4.1.3 Data compression MAY be used to reduce the size of files
> placed into a ZIP file, but is
