Precise GC

[dsimcha]

Just out of curiosity, is there any talk of any implementation of D getting
precise GC in the near future?  It seems like when running programs that
actively use a large fraction of the 32-bit address space, the partially
conservative nature of D's GC can actually become a significant limitation.
On the other hand, the long-term solution is 64-bit.  Is precise GC
technically possible with D, and if so, is there anyone seriously thinking of
implementing it?