That library had a hiatus with zero commits of over 1.5 years until recently iirc.

That this is working out is a combination of wishful thinking and getting lucky.

"Code frequency" for jxl-rs shows no activity from Aug 2021 to Aug 2024, then steady work with a couple of spurts. That's both a longer hiatus and a longer period of subsequent activity (a year+ ago isn't "recently" in my book.) What data have you based your observation on?