ContentRange
                    struct ContentRange
                
                
Inclusive index where the range ends, measured in this instance's  Unit.
            
Size of this range, measured in this instance's  Unit.
            
Inclusive index where the range starts, measured in this instance's  Unit.
            
Unit this range is measured in. Generally "bytes".
            
Determines if two  Unit values are the same.
            
Determines if two  ContentRange values are different.
            
Indicates whether this instance and a specified  RangeUnit are equal