Additional test for D<

[ellerh]

I'd like to suggest the following test for D<:
T{ 0 1 1 0 D< -> FALSE }T

While reading lbForth's code, I found this definition:
: d< rot > if 2drop -1 else u< then ;
which looked suprisingly concise to me, but it doesn't handle the test correctly. At the moment no other tests seems to expose the bug in lbForth's D<.

[gerryjackson]

Excellent suggestion, I'll incorporate it into the double number tests later today. I think that anything like this, where an implementation is incorrect but not detected by the test programs, should have a test included to detect the fault (if detectable of course).
Many thanks.

[gerryjackson]

Test added with similar test for negative operands. Also added for DU<