rht_put inserts the key-value pair (k -> v) into the replica.

If an equivalent key already exists in the rht, then the corresponding key-value pair will be overwritten.

*** Note that if multiple updates to the same entry are performed by different threads around the same time, then the one with the highest LTS (Lamport Time Stamp) will eventually "win," and some of those updates may never be applied to the dictionary at all as they will be seen as "out of date" by the replicas upon receipt.***