The vast majority of PLs are either self-hosted or implemented in a systems language (one without GC).
The only exceptions I can think of are PureScript, Elm (both written in Haskell), Hack (partly uses OCaml) and Clojure (Java). Are there others? Is it a good tradeoff?
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The vast majority of libraries have a single maintainer. Even if you weight by downloads, roughly half of downloaded libraries have a single maintainer too.
I hear people say that Go is often hard to search online (hence sometimes "Golang"), but the vast majority of language names are common words. Names with punctuation (C++, C#) are hard too.
Is this a big problem in practice? "Perl" isn't a dictionary word, but it's an exception.
It took me way too long to realise that Arc<Mutex<T>> is basically a way to create multiple &mut T references (with runtime constraints).
This means that you can use plain &T and &mut T in the vast majority of your code. Most code doesn't need to care there's a mutex.
