Optional ReadonlydeferredProperty atoms may live outside the primary ID index after parsing.
Optional ReadonlyentitiesOptional type fallback for a caller-supplied columnar source domain.
ReadonlyentityReadonlybyId: { get(id: number): { type: string } | undefined }ReadonlybyType: ReadonlyMap<string, readonly number[]>Source ids keyed by UPPERCASE STEP class.
The parser's source index shape, without a parser dependency.