Any library with higt-preposition doudles?

[ilya-stromberg]

On Thursday, 29 August 2013 at 13:53:42 UTC, qznc wrote:
> Phobos has std.bigint, but the documentation recommends GMP for 
> "very large numbers".
>
> http://dlang.org/phobos/std_bigint.html

No, I need double, not integer, so I can't use std.bigint.
I must provide at least 20-30 decimal digits without rounding 
after a decimal point.