Classes or Structs
The second can be used for a
class or a
init<Subject>(_ subject: Subject, children: KeyValuePairs<String, Any>, displayStyle: Mirror.DisplayStyle? = nil, ancestorRepresentation: Mirror.AncestorRepresentation = .generated)
Interesting to note, here, is that you provide the children (i.e.
properties) of your subject as a
KeyValuePairs<String, Any> which is a bit like
a dictionary only that it can be used directly as function parameters.