6 Aug
                
                    2014
                
            
            
                6 Aug
                
                '14
                
            
            
            
        
    
                7:13 p.m.
            
        That 2012 post by Takano Akio mentioned using headStrict to implement scanl' as well, and a few other functions, which sounds like a fantastic idea, as long as it turns out to actually be safe.