6.1.0250 0< zero-less CORE

( n -- flag )

flag is true if and only if n is less than zero.

Testing:

T{       0 0< -> <FALSE> }T
T{      -1 0< -> <TRUE> }T
T{ MIN-INT 0< -> <TRUE> }T
T{       1 0< -> <FALSE> }T
T{ MAX-INT 0< -> <FALSE> }T