Maybe EnumCount should respect `#[repr(...)]` like FromRepr

[martin-t]

The parameter of the generated from_repr has the type specified by the repr on the enum. However the COUNT associated const always has the type usize. This requires casts when composing the two (for example when doing arithmetic to get the prev/next variant).

I think it makes sense to also give COUNT the type from the repr (and usize of not specified). This is obviously a breaking change but it'll only affect people who specify a repr.

The most common repr type will probably be u8 which can convert to usize infallibly so if people specify #[repr(u8)] but want count as usize, they can convert using .into() without any unwraps. This is not the case currently - converting COUNT to the type required by from_repr is a fallible conversion and therefore needs unwrapping.

[Peternator7]

Agree this is probably more consistent with what people expect. Happy to take a PR if you're interested

[Bubbler-4]

A potential problem with this is that, if a #[repr(u8)] enum happens to have exactly 256 variants, the value of COUNT does not fit in u8.