Derive Macro Cast

#[derive(Cast)]
{
    // Attributes available to this derive:
    #[string]
}

Implements Reflect, FromValue, and IntoValue for an enum.

The enum will become castable from kebab-case strings. The doc-comments will become user-facing documentation for each variant. The #[string] attribute can be used to override the string corresponding to a variant.

/// A stringy enum of options.
#[derive(Cast)]
enum Niceness {
    /// Clearly nice (parses from `"nice"`).
    Nice,
    /// Not so nice (parses from `"not-nice"`).
    NotNice,
    /// Very much not nice (parses from `"❌"`).
    #[string("❌")]
    Unnice,
}