couchbase subdocument arrayAddUnique not working for non string objects

Question

GOT this error The unique value provided is not a JSON primitive

arrayAddUnique public AsyncMutateInBuilder arrayAddUnique(String path, T value, boolean createParents)

If i pass value as a string it works. Example - arrayAddUnique("path", "value", false)

But if i pass value as an Object I get can't insert error. MultiMutationException Example - arrayAddUnique("path", someobject, false).execute();