Is there a good lib out there to handle large integer of know size ?

[Era Scarecrow via Digitalmars-d]

On Sunday, 11 June 2017 at 21:52:40 UTC, Era Scarecrow wrote:
>  Also got Cent working (mostly).

  It's complete, more or less now. I just a matter of filling in 
any missing methods that I haven't programmed for, and probably 
adding filler/forwarding functions from ScaledInt to UScaledInt.

  Although I'm quite happy to change (ScaledInt) if someone has a 
better idea name idea.

  I'll be in the D IRC chat for the next week or so, so if anyone 
wants to talk to me directly... When it's good enough I'll submit 
my code to the std.experimental branch.

  Also I need to compile/test the asm, I don't have it set up here 
(can compile, can't run).