...


"Tcl is mostly in good shape for 64-bit platforms. The 'mostly' comes
because anyone wanting any individual entity larger than 2GB (which is
still a definitely humongous string!) will be in trouble. There is a
major piece of clean-up still required to fix that (it's bug 219196, and
as you can see it's been known about for a long long time), but I'm
planning to put that off until Tcl 9.0 because it is totally
incompatible with preceding API versions at the binary level on 64-bit
platforms (might also require source changes, but it's the binary-level
stuff that's the problem)."

(Quote is from [dkf] on comp.lang.tcl


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[Category Internals]