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8793a6d351
Previously it could lead to contract violations for example consider
this:
A = Library{ Name:"A", Types: ["Sensors"] }
B = Library{ Name:"B", Types: null }
C = Library{ Name:"C", Types: ["Arduino"] }
it results in:
A<B (because B has Types==null and compare("A","B")<0)
B<C (because B has Types==null and compare("B","C")<0)
C<A (becuase C has Types=="Arduino" and the comparator returns -1)
This commit fix this behavior