Restricted type casting from integer types to float types and vice versa

[nobel-sh]

gccrs does not allow conversion from integer type to float type and float type to integer type.

fn main(){
    let a: u8 = 13;
    let b:f64 = a as f64;
}

gccrs produces the following error:

<source>:3:17: error: casting 'u8' as 'f64' is invalid [E0606]
    3 |     let b:f64 = a as f64;
      |                 ^    ~~~

Godbolt link: https://godbolt.org/z/qorqTvfbx