just to answer the question if its still there
there is no data type like that in flash its more common in back end langauges but if you just want to deal with integers 'int' is your best bet( flash only has 3 number types : number,int,uint) there is performance improvements for using int over number but no performance difference between int and uint.
Number - real numbers
int - integers
uint - only values 0+ its not endless but its much more then 255