That’s really not true. You don’t have to take my word for it: try it with fib(1000), say. The answer should be: 4346655768693745643568852767504062580256466

That’s really not true. You don’t have to take my word for it: try it with fib(1000), say. The answer should be: 43466557686937456435688527675040625802564660517371780402481729089536555417949051890403879840079255169295922593080322634775209689623239873322471161642996440906533187938298969649928516003704476137795166849228875