DIP80: phobos additions

[Dennis Ritchie via Digitalmars-d]

On Tuesday, 9 June 2015 at 18:58:56 UTC, Andrei Alexandrescu 
wrote:
> On 6/9/15 11:42 AM, Dennis Ritchie wrote:
>> "And finally `std.bigint` offers good (but not outstanding) 
>> performance."
>
> BigInt should use reference counting. Its current approach to 
> allocating new memory for everything is a liability. Could 
> someone file a report for this please. -- Andrei

Done:
https://issues.dlang.org/show_bug.cgi?id=14673