GitHub will allow you star repo topics, not just individual repos: https://blog.github.com/2019-01-08-topic-starring/
Topics can be useful as a kind of hashtag to say what your project is about. I've not found them very useful for discovery so far. This could change usage patterns and improve matters!
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When talking about a match or a switch statement, I've typically seen people talk about individual 'cases' or 'arms'.
TIL Zig uses 'prongs' instead!
I've heard of 'blub languages', where you don't realise that other languages have better abstractions until you've experienced them.
I think the same thing happens with individual features. I've seen several C++ folks miss variadic generics in Rust, but I've not written enough C++ to feel it.
One interesting side effect of software productivity increasing: libraries can become more idiosyncratic.
It's easier than ever to release important libraries as an individual. Single-maintainer projects inevitably have more personality -- for both good and bad!