Parameters

1. value {Object}:

   A value to be used for a new instance instead of a new object.

   var Student = function( name, school ){
       this.name = name;
       this.school = school;
   }
   
   var Person = Construct.extend({
       setup: function( options ){
           if (options.school){
               return new Constructor.ReturnValue( new Student( options.name, options.school ) );
           } else {
               return [options];
           }
       }
   });
   
   var myPerson = new Person( {name: "Ilya", school: "PetrSU"} );
   
   myPerson instanceof Student // => true