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There is a very similar issue with the Python API (docplex).
I have a model with some "hard" constraints, and 0 or more "soft" constraints. The problem is that I don't have a good interface in docplex for setting those constraints.
In the case of 2 or more constraints, I use maximize_static_lex (the first constraint is more important then the second, which is more important than the third, and so on...). But if I try to use it with just 1 constraint, I get this error:
Error: Multi objective must have at least 2 criteria.
My request is to extend it so that if I call maximize_static_lex() with a list of length 1 it will behave like maximize(). Additionally, if the list is empty it will not do anything. If this is too difficult, then at least it should give a better error message, right when calling maximize_static_lex() and not on solve().
Simple example:
mdl = CpoModel()x = mdl.integer_var(min=0, max=9, name="x")y = mdl.integer_var(min=0, max=9, name="y")mdl.add(x + y < 15)mdl.add(x <= y)mdl.add(mdl.maximize_static_lex([x != y]))msol = mdl.solve(TimeLimit=10)