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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
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