I wonder if there's any trick or library to get rankable enums in Common Lisp.
In general I define a set of enums like this
(deftype weekdays()
'(member :sunday :monday :tuesday :wednesday :thursday :friday :saturday))
Surely I can compare two variables for containing the same weekday, e.g. if both contain :wednesday.
But I want to compare two different weekdays like "Is :thursday later than :monday"? That brings me back to constants
(defconstant +sunday+ 0)
(defconstant +monday+ 1)
and so on...
but that seems to be bad style.
What is best practice for doing this?