The limitation of compressing zip archives with other streams only occurs when using multiple formats, like:

archive.zip.gz, or archive.zip.xz.xz.xz.xz.

.zip requires io::Seek, and it can only be provided in fs::File and Vec<u8>, so we can either compress directly to the final file, or load into a Vec, but not pipe to encoding streams.

Loading the whole file to a Vec might exhaust memory capacity, that's why we need to give those warnings in specific cases.

While filing this, I found out the decompression command has another warning with different formatting:

These messages formats should be consistent.