>   a = new Interval[2,3]
>
>   But that's slightly cumbersome.  So, what notation can we use for
> intervals that's:
>
>   1.) Possible to type on an ordinary keyboard
>   2.) Uses only ASCII characters
>   3.) Unambiguous
>   4.) Doesn't force change of existing syntax.
>   5.) Quick to type
>   6.) Not too visually noisy
>   7.) Visually distinguishable from other constructs    8.) It
> should still kinda look like [2, 3]
....
>   So, who can come up with the best way to write intervals
> concisely?

What about A .. B?

Examples:

for i = 0 .. 100 ; do
fa[i] = f[i] + f[i-1];
done

lunchtime = 12am .. 1pm
if x in lunchtime; then
do_lunchtime_event ;
endif

timeperiods = [ 8am .. 9am, 12pm .. 1pm, 5:30pm .. 6:30pm ];