Lookup entries in the server(s).
The map is from String keys to UIDs. The key is the "getAll"
name or "list" suffix. If the client has a cached Record
from a prior lookup then it can pass the UID of that Record
to request a RecordIsValid response, otherwise it should pass
a null UID. If the current record's UID doesn't match
the UID then a full Record will be sent back.
It's fine to submit a singleton map, but for efficiency a
client can use this API to batch requests.
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