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All CRDT updates at the coordinator include a merge with and empty CRDT before the update is applied. So the merge function should be optimised to avoid extra work should the RHS CRDT be empty.
Dialyzer complained, but it was important that the variables were matched (though ignored).
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Optimises the merging of a set for the case when the Right-Hand Set is empty.
When updating a set, there is always first a merge with an empty set, followed by an update to add a member or members. So optimising a merge with an empty set will improve performance.
OpenRiak/riak_kv#50 (comment)