Is there a trait "As"?

[jbe]

I also struggle a bit when writing methods that shall be generic over f32 and f64. From a previous post of me:

@jbe

I see three and a half ways to go (which may be different for the API and internal/private functions):

• Not use generics and only work on f32 and f64 directly
  • either by duplicating code manually
  • or through macros;
• Using a trait alias (or trait with blanket implementation on stable Rust) that combines something like num_traits::float::Float with any other traits that are needed for a particular use case;
• Using an own (possibly sealed?) trait that's directly implemented for f32 and f64.

I decided to implement my own trait in radiorust for my particular use case: radiorust::numbers::Float.