The ultimate thing is, I don't think the constructor should be named "Constructor"
In JavaScript, the constructors are called Object, Person, Worker, Animal, Dog. It is not called a Constructor or PersonConstructor.
For
var person = new Person();
person is an instance of the class Person. person is a Person.
For
var observable = new can.Observe(foo);
it doesn't have the parallelism to say:
observable is an instance of Constructor. observable is a Constructor.
observable is a CanObject. observable is not a Constructor.
