I want Badger transactions to provide an exact-key historical iterator with the public Go method func (txn…

I want Badger transactions to provide an exact-key historical iterator with the public Go method func (txn…: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). For a database that has committed two versions of key acct with values v1 then v2 , and also has a separate…

The task

For a database that has committed two versions of key `acct` with values `v1` then `v2`, and also has a separate key `acct:meta`, `txn.NewKeyIterator([]byte("acct"), badger.DefaultIteratorOptions)` should produce only items whose `Item().Key()` is exactly `acct`; it must not continue into `acct:meta` just because…

Part of FineEnvs/MiMo-V2.6-RL-harbor-code.