store
The store underneath, unwrapped.
The escape hatch, and it is a supported one rather than an admission: everything the facade does not cover — scanSegments, liveSegmentNumbers, backfill with an observer of your own — is here, at full width, unchanged. Do not close it; close does, in order.
Outside the stable core, and this property is the entrance that says so: the store's surface is the engine's internals at full width, and pinning it would pin the engine. See STABILITY.md.