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Why do I need to see machine-specific types like i32 in a lecture about closures?

What is machine-specific about i32? It's a signed 32-bit integer, regardless of the machine you're on.

Why not use i36 then?

Because that's not a type in Rust. I don't understand where you're going with this.

Why isn't that a type in Rust? It's a signed 36 bit integer, regardless of the machine you are on.

There are several crates which provide this type if you want it, such as ux and num_x