code: HashCode hashObjWithSalt(T object, int moreSalt) {
  		Hasher hashInst = hasher.newHasher();
  		hashInst.putObject(object, funnel);
  		hashInst.putLong(seedNSalt);
  		hashInst.putInt(moreSalt);
  		return hashInst.hash();
  	}
docs: hashes the object with an additional salt. For purpose of the cuckoo
  filter, this is used when the hash generated for an item is all zeros.
  All zeros is the same as an empty bucket, so obviously it's not a valid
  tag.