A resolved pair: the index it occupied in the parsed chain, and the qualified graph node id it
resolved to. null in the caller's result array means the pair didn't resolve (unknown key or
no matching node); how an unresolved pair is surfaced is the caller's concern.
A resolved pair: the index it occupied in the parsed chain, and the qualified graph node id it resolved to.
nullin the caller's result array means the pair didn't resolve (unknown key or no matching node); how an unresolved pair is surfaced is the caller's concern.