Rust does go overboard though, e.g. indexing requires `usize`. You either use `usize` for all your integers, or you end up with a cast-salad.

   arr[i as usize]

This is actually risky, because even when you only meant to extend, you can also accidentally truncate or change sign. `as` does all of these things without a warning, and mixed with type inference it can easily lead to surprises.

Rust makes it worse by insisting on a theoretical support for 16-bit and 128-bit `usize` regardless of the target platform, so you can't use `a[i.into()]` to infallibly convert `u32` to `usize` on 32-bit and 64-bit platforms.

The correct syntax is:

   arr[usize::try_from(i).unwrap()]

which is painfully verbose. In larger expressions it's almost an obfuscation of what the code is actually doing.