Escape Hint

Optional. Serialization hint consulted by backends when emitting a value. If omitted, the backend applies its default escaping for the value's type. As of 1.3.0 the domain is EscapeHintable, so a hint may sit on a StructuredEntry (covers a scalar held under a map key) or on a StructuredValue directly (covers a scalar inside a StructuredList, which has no entry of its own). When both are present the entry-level hint wins.