We just thought it would be clever to return undef if you were out of bounds, which tcl code would see as "" which is what you'd get in tcl. But Little code could actually tell you are past the end.
In my mind, which many have argued isn't the best, it's a reasonable design.
You keep trying to push backwards to a design point where arrays are fixed in size at declaration and that is not how tcl (or Little) works.
