$.Class() fails to run superclass constructor on multi-level inheritance

[LeaVerou]

Testcase:

var Foo = function(){ console.log("Foo") };
var Bar = $.Class({extends: Foo, constructor: function(){ console.log("Bar") }});
var Baz = $.Class({extends: Bar, constructor: function(){ console.log("Baz") }});
var baz = new Baz(); // prints Bar and Baz, but not Foo

I’m working on debugging this right now, anyone wants to turn the testcase above into a test with spies?