 
            
            
            
            
                8 Jan
                
                    2013
                
            
            
                8 Jan
                
                '13
                
            
            
            
        
    
                8:16 p.m.
            
        Is the Unsafe module all about getting efficient conversions between types that have the same representations due to embedded newtypes? (If so, the issue is not about functoriality.)