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kotlinlang

Not sure, but maybe with inline class ? See this modified playground : <https://pl.kotl.in/U09d9eWIB|https://pl.kotl.in/U09d9eWIB>

I don't think you can use inline class w/ basic types.. you also can't add/overload operators w/ inline class (at least not the last time I tried, which was a few versions ago).

hmm... actually, I think everything I just said is wrong.

But they can only be immutable, so I'm not sure how to get `+=` to work?

Look at the playground I attached. It is done in it. However, be careful, because operator overloading in Kotlin is a syntactic sugar for functions, it does not follow math operation priority : <https://kotlinlang.org/docs/operator-overloading.html|https://kotlinlang.org/docs/operator-overloading.html>

that'll work. Thanks for the tip on operation order... good to know.

I'm not on 1.5 yet cuz of a bug in the null `?.` operator. Should be fixed in 1.5.30 though, and `JvmInline` doesn't exist in 1.4.x so I'm a little SOL for now. but thanks!