BigFloat?

[Vlad Levenfeld via Digitalmars-d-learn]

On Tuesday, 17 February 2015 at 13:55:15 UTC, Dominikus Dittes 
Scherkl wrote:
> We have rational (two bigint, one for the numerator and one for 
> the denominator), which I like better than floatingpoint (it's 
> more expressive).

Yeah, this is probably the best that can be done, since any 
arbitrary-precision float is just gonna be a subset of Q anyway.