WCF Instancing mode default is InstanceContextMode.PerSession

Keith Brown has been experimenting with InstanceContextMode.  This is the property on System.ServiceModel.ServiceBehaviorAttribute that determines how WCF handles instancing.  Keith correctly notes that the current documentation is wrong about the default value for this property.  The default value is not PerCall, but rather PerSession.  We changed this in the June CTP.  Here’s the reasoning: “With PerCall,…