conver BigInt to string

[bearophile via Digitalmars-d-learn]

> void main() {
>     import std.stdio, std.algorithm, std.conv, std.bigint, 
> std.string;
>
>     auto n = 17.BigInt ^^ 179;
>     n.text.dup.representation.sort().release.assumeUTF.writeln;
> }

Better:

     n.to!(char[]).representation.sort().release.assumeUTF.writeln;

Bye,
bearophile