AA rehash threshold

[Martin Nowak via Digitalmars-d]

On Wednesday, 19 November 2014 at 02:16:36 UTC, Steven 
Schveighoffer wrote:
> Any thoughts from the experts out there?
>
We'll throw the current implementation away and implement an open 
addressing AA once we get to it. So don't worry about the load 
factor right now.
https://github.com/D-Programming-Language/dmd/pull/4088#issuecomment-63152848