Thanks, Dan.
I certainly didn't do those kinds of operations with boxes (I guess, yet).
I do remember (Henry's, but may be he wasn't first) advice not to make boxes
small (i.e., with small content). Once I was solving a problem "write a program
which puts + - * / ^ and () operations around five 9 to make 1000", and found
out that boxes slow things down quite noticeably. So I'm trying to avoid need
for boxes as much as I can - though not for the price of having to filter out
0's in
1 2 0 0
3 4 5 6
7 8 9 0
I guess you're right - implicit boxing wouldn't buy much in terms of
performance, but brief boxing gives you both precision (you don't need to guess
if this thing is boxed - you just see that) and convenience (not too hard to
add &.> whenever needed).
Alexander
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