Returns a claim by ID and version, or undefined if not found.
The claim ID.
The claim version number.
The claim entity, or undefined.
Returns the latest version of a claim for the given ID, or undefined
if the claim does not exist in this lookup.
Implementations backed by a flat array (e.g. createLookup) return the
item with the highest version number for the given ID. The full
ClaimLibrary class tracks versions natively and returns its internal
latest version directly.
The claim ID.
The latest claim entity, or undefined.
Narrow read-only interface for claim lookups. Used by
ArgumentEnginefor variable validation — callers that only need to verify claim existence should depend on this rather than the fullClaimLibrary.