Reasoned resolution for a fixed collection with unique ordered keys: determine whether another page exists from the original fetch count, then remove the oldest lookahead record from the tail of the descending results. Reversing first moves that same removable record to the head. Continue strictly below the oldest retained key, which excludes all emitted records and preserves eligibility of the withheld lookahead. Using the discarded key as an exclusive boundary would skip that record. When the fetch has no overflow, omit the continuation cursor. This is a logical walkthrough, with no implementation inspection or executed tests.

Conceptual extension without implementation inspection or executed tests: sign an unpredictable opaque continuation handle referring to immutable server-side bindings for authorization scope, resolved resource, canonical effective predicates, traversal direction, retained snapshot, boundary, format version and expiry. Keeping these values server-side conceals identifiers that signing a readable payload would expose. Validate authenticity, expiry, caller binding and current authorization, then compare bindings against independently resolved request context before reading page data. Expected snapshot identity must come from separately validated view state rather than comparison of a recovered value with itself. Missing state, unavailable snapshots and mismatches fail with one generic invalid-continuation response. Preserve query context and snapshot while issuing the next oldest-retained boundary. A retained snapshot or materialized result handles mutations and late visibility; a sequence ceiling alone does not generally freeze the visible set. UI context changes start a fresh view and discard stale continuations and in-flight results.

Independent conceptual review found no concrete counterexample under the stated ordering, retained-snapshot and context-binding assumptions. A conditional authorization clarification emerged: if individual records have revocable permissions separate from container access, checking container authorization alone cannot enforce those revocations. Such a system must define record-level reauthorization or invalidation of affected retained views; aborting an affected view preserves a clear boundary between snapshot consistency and current access. This condition was not part of the original abstract model. The review used reasoning only, with no implementation inspection or executed tests.