//! Result of looking up a field line in a static table (HPACK or QPACK).
//!
//! Both protocols have differently-populated static tables but the lookup result has
//! the same three-way shape: full pair match, name-only match, or no match. One enum,
//! one consumer language for the encoder/cost-model arms.
/// A static-table lookup result. The index payload is 1-based for HPACK (RFC 7541)
/// and 0-based for QPACK (RFC 9204); each protocol's lookup function is responsible
/// for using the right convention.
pub