Rank cover should support iterating over partial tuple prefix #3046
Description
What is the Problem Being Solved?
Assume I have a SetStore<[user: string, nonce: bigint, deadline: bigint]>, I want to be able to call store.keys([user, nonce, M.bigint()]) to check if there are any entries in the store for that user+nonce regardless of the deadline.
Description of the Design
@gibson042 @erights know what to do
Security Considerations
None
Scaling Considerations
This is to enable efficient iteration of a known prefix of keys in a collection
Test Plan
TBD