< operator consumes two parameters p1 and p2 from the top of the stack and pushes onto the stack true if p1 < p2, else it pushes false.
The two parameters must be of numeric or string types.
Strings are compared lexicographically.
Since Warp 10™ 2.1, as every other comparison operators,
< can also be used between two GTS or a GTS and a constant.
$gts 42 < is strictly equivalent of a
42 mapper.lt MAP operation, with a simplified syntax.