ResolvedBag (an assembly CultCacheFormatterResolver writes [count, items...]) and TagList
(List<string> with [MessagePackObject]) are falsely marked by the attribute-based guard (Soul s2,
guard-asks-attribute-not-formatter). extra-slot-store.cc gains marked-variant, a variant of
marked; slot-outcomes.msgpack rows gain a ninth column, the key whose refusal refuses a Flatten.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>