NYI: Order enum

[coke]

From S03, about comparison operators:

These operators compare their operands using numeric, string,
or C semantics respectively, and depending on the order return
one of COrder::Increase, COrder::Same, or COrder::Decrease
(which numerify to -1, 0, or +1). See L</Comparison semantics>.

Right now pugs is just using the numeric values.