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kotlinlang

<https://twitter.com/dh44t/status/930276952358912003>

What is the performance overhead of using *typealias*?

<@U5R5FGVH7> none, the typealias does not exist at runtime. is replaced by the actual type at compile-time

So in effect there is a form of inlining going on.

<@U5R5FGVH7> yes, `typealias MyDouble = Double` the compiler will replace all occurences of `MyDouble` with `Double`. Be aware, that when you have a parameter with the type `MyDouble`, you can pass a `Double`,

i'm looking forward to the day when kotlin supports non type compatible typealiases, would be a huge win for e.g. ids

I think that there is some proposal for value classes, it should cover that case