It is what swyx said.. cardinality not in the mathematical sense.. but the fact it does not exisit, there is exactly one instance of it or there are many instan

It is what swyx said.. cardinality not in the mathematical sense.. but the fact it does not exisit, there is exactly one instance of it or there are many instances of it. Going from one to another means refactoring/through testing as there would be side effects all through the system.