Intriguingly, parts of IBM's Watson are written in Prolog! https://softwareengineering.stackexchange.com/a/51137 (I've not encountered other Prolog usage in the wild yet)
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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.
It's odd that games often show the hours played, but I've not seen this in other apps.
"You've spent 20 hours talking to this person." Would this be a usage deterrent? If so, why do many games offer it by default?
WebAssembly seems like a totally reasonable bytecode format, but I've not had many opportunities to use it so far.
Has wasm found its 'killer app' yet?