Revamping associative arrays

[Robert Clipsham]

Andrei Alexandrescu wrote:
> Any other issues with AAs that you want to see fixed, and ideas guiding 
> a redesign?

Their speed. I did a benchmark a while ago comparing tango's HashMap 
implementation and built in AAs, tango's hashmaps were twice as fast... 
It'd be nice if the built in language feature was faster than an 
implementation done within the language! :)