A trait to treat any type as an enum. If a type has a reasonably small number of variants, for example a `struct A(bool, bool)` which has 4 variants, this trait provides a 1-to-1 mapping from type value to a discriminant value. It also provides an iterator over all the possible values. This crate is mainly meant to be used along with [enum_like_derive](https://crates.io/crates/enum_like_derive) and [enum_vec](https://crates.io/crates/enum_vec) .