Good point, thanks mwb.
IIRC, those issues are mainly concerning Windows, and I've been seeing around the 'net advice to stick with 32-bit programming for most common app development unless you need
64-bit for the numerical precision or memory handling.
I do everything on Linux nowadays, though I have run into add-ons that had issues with 64-bit, most notably the BGRABitmap library
, which has been fixed in the development branch.