PFCOUNT key [key ...]
#Example
redis> PFADD hll foo bar zap
(integer) 1
redis> PFADD hll zap zap zap
(integer) 0
redis> PFADD hll foo bar
(integer) 0
redis> PFCOUNT hll
(integer) 3
redis> PFADD some-other-hll 1 2 3
(integer) 1
redis> PFCOUNT hll some-other-hll
(integer) 6
Return the approximated cardinality of the set(s) observed by the HyperLogLog at key(s).
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