The hasUnknownModelCost schema field is now built through a helper rather than declared inline, and a new helper computes narration_block_indexes from an array. Both are internal cost/narration telemetry changes with no clear user-facing effect.
New hasUnknownModelCost / narration block indexes plumbing
Internal cost/narration telemetry fields were refactored with no clear user effect.
Under the hoodTier: how much it should matter to you
1Useful: my rating, 1 to 5
0Signal: worth watching, 1 to 5
ElsewhereArea: what it touches
Internal ChangesKind: in v2.1.260,
Internal ChangesSection of the release