{"id":"format-range-single-vs-arrow","text":"`_format_range(a, b)` returns `\"a\"` when endpoints are equal and `\"a->b\"` otherwise; it is only ever called with `a <= b`, guaranteed by the gap-detection guards.","truth_value":"IN","source":"entries/2026/06/06/missing-ranges-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"format-range-single-vs-arrow","truth_value":"IN","reason":"premise"}]}}