By "silly", I wanted to say that the question is asking "why is sky not blue" although sky is blue. Private attributes can be defined in any class, even test classes (although I don't understand why you need to define types in test classes, I think of situations where I could possibly need types for defining a short list of columns to compare but instead I'm using constructor expressions).
Generally, custom classes are created as local definition and implementation is done separately. So, we do the data declaration in the definition part of the class.
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