Type Alias ExtensibilityKind 

pub type ExtensibilityKind = Extensibility;

Spec-aligned alias: zerodds-xcdr2-rust §2 references the Extensibility enum under the name ExtensibilityKind. We keep Extensibility as the implementation name; both are identical via the alias.

Aliased Type

#[repr(u8)]
pub enum ExtensibilityKind {
    Final = 0,
    Appendable = 1,
    Mutable = 2,
}

Variants

Final = 0

@final: tight-packed body, no header.

Appendable = 1

@appendable: 4-byte DHEADER + body, forward-compatible.

Mutable = 2

@mutable: one EMHEADER + body per member.