Poll: Primary D version

[Sean Kelly]

Andrei Alexandrescu Wrote:
> 
> It all depends on what the largest payload is. One of my apps' largest 
> structures was a hash, which was almost twice as large in the 64-bit 
> version.

It's always possible to trim down the bits used for a pointer inside a data structure if the savings really matters.  Doing so can create some really interesting bugs though.