"summary":"Return the approximated cardinality of the set(s) observed by the HyperLogLog at key(s).",
"summary":"Returns the approximated cardinality of the set(s) observed by the HyperLogLog key(s).",
"complexity":"O(1) with a very small average constant time when called with a single key. O(N) with N being the number of keys, and much bigger constant times, when called with multiple keys.",