Why is the use of range validators restricted to primitive types?

[shugo256]

I wanted to use the range validator for my ordered enum type.

#[derive(Clone, Debug, PartialEq, PartialOrd)]
enum MyOrderedEnum { 
    First,
    Second,
    Third,
    Fourth,
}

#[derive(Validate)]
struct SecondOrThird {
    #[validate(range(
        min = "MyOrderedEnum::Second", 
        max = "MyOrderedEnum::Third"
    )]
    val: MyOrderedEnum
}

But I got the following error:

Validator `range` can only be used on number types but found `MyOrderedEnum` for field `val`

I noticed that this is explicitly checked with assert_has_range instead of letting the compiler check if the type implements PartialEq and PartialOrd.

I would like to know if there is any background to this or if it can be fixed.

Thank you.

[pintariching]

Maybe this could be solved with #225?

[Keats]

It might be possible yes.