Result instantiation produces suboptimal warnings

[tritao]

Take the following code:

script;

use std::result::*;

fn main() {
    let a: Result<u32, u8> = Result::Ok(5);
}

Produces the following warnings which don't point to the actual problem and seemingly related to the same issue but duplicated pointing to different locations.

  Compiled library "std".
warning
  --> /home/joao/dev/sway/sway-lib-std/src/result.sw:15:5
   |
13 | 
14 |     /// Contains the success value
15 |     Ok: T,
   |     ----- This cast, from integer type of width sixty four to integer type of width thirty two, will lose precision.
16 |     /// Contains the error value
17 |     Err: E,
   |
____

warning
  --> /home/joao/dev/sway/sway-lib-std/src/result.sw:13:17
   |
11 | 
12 | /// ([`Err`]).
13 | pub enum Result<T, E> {
   |                 - This cast, from integer type of width sixty four to integer type of width thirty two, will lose precision.
14 |     /// Contains the success value
15 |     Ok: T,
   |
____

[otrho]

This is related to #3470 and assuming prematurely that a Numeric is a u64.

Also similar to #606