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Fetches not acknowledging pending entries
@example With key and group
redis.xpending('mystream', 'mygroup')
@example With range options
redis.xpending('mystream', 'mygroup', '-', '+', 10)
@example With range and consumer options
redis.xpending('mystream', 'mygroup', '-', '+', 10, 'consumer1')
@param key [String] the stream key
@param group [String] the consumer group name
@param start [String] start first entry id of range
@param end [String] end last entry id of range
@param count [Integer] count the number of entries as limit
@param consumer [String] the consumer name
@return [Hash] the summary of pending entries
@return [Array<Hash>] the pending entries details if options were specified