def all(pattern: SCAN_PATTERN, count: DEFAULT_COUNT)
      redis { |conn| conn.sscan_each(UNIQUE_SET, match: pattern, count: count).to_a }
    end
def all(pattern: SCAN_PATTERN, count: DEFAULT_COUNT)
      redis { |conn| conn.sscan_each(UNIQUE_SET, match: pattern, count: count).to_a }
    end
Return unique digests matching pattern

 @param [String] pattern a pattern to match with
 @param [Integer] count the maximum number to match
 @return [Array<String>] with unique digests