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As other said, only implicit typing in Rust is for integer and float see RFC 212. I don't like at all this exception in Rust, I don't like exception if they are avoidable, specially the rational in the RFC say "first encounter with Rust", so the purpose is to make it more simple for Rust beginner to "start" with Rust.
This changed (as I warm of it 8 years ago...) because a pointer isn't just a number, pointer is "something that contains information for a system about memory location", Rust didn't care about this problem until people from Rust wanted to use Rust on CHERI and discover that well CHERI have provenance information in pointer and you can't use processor bus size to store a pointer. So now usize is address size integer. More info https://github.com/rust-lang/rust/issues/95228
(That's how certain kinds of extensibility work in the validator crate. You just impl a method and validator won't care where it comes from as long as it's in scope because it's built using declarative macros.)