offInstanceBoundChange(Type, handler, [queueName])

Unregister an event handler from the type Type that had previously been registered with onInstanceBoundChange. The function passed as handler will no longer be called when instances of Type gains its first or loses its last binding.

Person = DefineMap.extend({ ... });

var person = Person({});
var handler = function(instance, newVal) {
    console.log(instance, "bound state is now", newVal);
};
var keyHandler = function() {};

canReflect.onInstanceBoundChange(Person, handler);
canReflect.offInstanceBoundChange(Person, handler);
canReflect.onKeyValue(obj, "name", keyHandler);  // nothing is logged
canReflect.offKeyValue(obj, "name", keyHandler); // nothing is logged