need to check it again even when passing it around.
                  
                  
                  2) you don't know the order of operations?
                  
                  
                  3) not an issue if you force all to have a value.
                  
                  
                  4) bounds checking catches this.
                  
                  
                  5) debatable as we don't always care.
                  
                  
                  6) no, eliminate them.
                  
                  
                  7) what?
                  
                  
                  8) data type.
                  
                  
                  9) ...
                  
                  
                  10) don't cast ever
                  
                  
                
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