insheet, you should visit STATA update and get an updated executable. The
doubleoption has a bug in 8.0. We've also recently found a bug in
tsfillwith very large datasets. The fix is pretty simple. Thanks to Sergey Chernenko on both of these.
Donald Knuth offered this warning about some code: “Beware of bugs in the above code; I have only proved it correct, not tried it.”