| The Orderable interface represents a value that can
be linearly ordered.
Currently only supports linear (<, =, <=) operations.
Eventually we may want to do other types of orderings,
in which case there would probably be a number of interfaces
for each "class" of ordering.
The implementation must handle the comparison of null
values. This may require some changes to the interface,
since (at least in some contexts) comparing a value with
null should return unknown instead of true or false.
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