Default property handler?

[aubergine]

Is there any way to implement a default property handler in JS API?

For example, if I have an object "foo" that does not have a ".bar" property, then if I try accessing foo.bar the default property handler would be invoked so I could still return something. This sort of functionality would only be required for certain types of object.

Something like Mozilla's __noSuchMethod__ but that would be like a default getter/setter for properties (so the getter could return any value, including a function).