That makes a lot of sense. I'm going to convert my code to do this.
When narrowing an integer, would as be idiomatic, try_into, or either?
It depends on the desired behavior. try_into will error and return nothing useful, while as will truncate. As far as I'm aware, there's not yet a suitable replacement for truncating (though I may just be unaware of it).
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try_into is better.
For two reasons: it is more limited in what kind of casts it does, and it will catch overflow.
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In order to be as explicit as possible, I tried using into/try_into in place of as for all integer conversions, but in the end I went back to as. It turned out that the behavior I wanted, and had been aware of when originally coding, is exactly what I get from as, and the result is more readable.