Behavior when map has no listener changed

[Macrofig]

Previously (at least in CanJS 3.2), the behavior for can Map getters would behave one way in respect to setting a value. In 3.11, the behavior has changed.

In 3.2, if a getter had a listener registered on it, the response would be the result of any setter that was previously run. If there was NO listener, than the result would be the result of the getter compute.

In 3.11, regardless if there is a listener or not, the result is always the getter function result.

3.2 JSBin: http://jsbin.com/fakive/11/edit?js,console
3.11 JSBin: http://jsbin.com/ruponoc/11/edit?js,console

Basically, there needs to be some way to get the old behavior as this caused breaking changes.