Enum FlagKind 

#[non_exhaustive]
pub enum FlagKind {
    Bool,
    Enum,
    String,
}

What kind of value (if any) a FlagSpec carries.

Typed (not &'static str) so a typo can’t slip into the wire format and the Enum-implies-values-present invariant is expressible at the type layer (see #215 for the design pass). Serialises as the lowercased variant name: "bool", "enum", "string".

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Bool

Boolean switch (no value).

Enum

Value-bounded flag — values carries the accepted set.

String

Any non-Bool, non-Enum flag. Today every such flag emits "string"; richer typing (Path / Int etc.) is intentionally out of scope until a real consumer needs it — #[non_exhaustive] reserves space without commitment.

Trait Implementations

impl Debug for FlagKind

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Serialize for FlagKind

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.