score property
Score ranks this span against the OTHERS IN THE SAME RESPONSE and means nothing across responses or between tiers: the hybrid tier's number is a reciprocal-rank fusion sum (Σ 1/(60+rank), so tenths at best), the symbol tier's is a descending position count, and the text and semantic tiers pass through bm25 and cosine. Compare within a list; never threshold on it.
Please note: This property should have been non-nullable! Since the specification file does not include a default value (using the "default:" property), however, the generated source code must fall back to having a nullable type. Consider adding a "default:" property in the specification file to hide this note.
Implementation
num? score;