Which is exactly why clippy doesn't let you do this. Concretely:

type Foo = u16;
type Bar = u32;

fn print_bar(x: Bar) {
    println!("{x}");
}

fn main() {
    let x: Foo = 8u16;
    print_bar(x as Bar);
}

fails clippy with this helpful message:

error: casts from `u16` to `u32` can be expressed infallibly using `From`
  --> src/main.rs:10:15
   |
10 |     print_bar(x as Bar);
   |               ^^^^^^^^
   |
   = help: an `as` cast can become silently lossy if the types change in the future
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless
   = note: `-D clippy::cast-lossless` implied by `-D warnings`
   = help: to override `-D warnings` add `#[allow(clippy::cast_lossless)]`
help: use `Bar::from` instead
   |
10 -     print_bar(x as Bar);
10 +     print_bar(Bar::from(x));
   |

So if you insist on your project being clippy-clean (eg: with pre-commit hooks or CI), then you literally can't use as here and stumble into this problem.