Reproduction components for a Spring '18 issue with virtual classes and lightning

MyOverrideClass.cls

public class MyOverrideClass extends MyVirtualClass {

    @auraEnabled
    public override String getName() {
        return 'MyOverrideClass';
    }
    
    @auraEnabled
    public override Object getObj() {
        return 'Hello World';
    }
}

MyVirtualClass.cls

public virtual class MyVirtualClass {
    
    @auraEnabled
    public virtual String getName() {
        return 'MyVirtualClass';
    }
    
    @auraEnabled
    public virtual Object getObj() {
        return 99;
    }
    
    @auraEnabled
    public Integer getVirtualOnlyValue() {
        return 1;
    }
}

virtualClassTest.cmp

<aura:component controller="VirtualClassTestController" implements="forceCommunity:availableForAllPageTypes" access="global" >
	
    <aura:attribute name="dataString" type="String" access="PRIVATE" />
    <aura:handler name="init" value="{!this}" action="{!c.doInit}" />
    
    <lightning:card title="Spring '18 Issue Reproduction">
        <p class="slds-m-vertical_small">We should be seeing a <code>name</code> value of "MyOverrideClass" and an obj of type String with a value of '11'</p>
        <h2 class="slds-text-heading_small">Data</h2>
        <pre>{!v.dataString}</pre>
    </lightning:card>
</aura:component>

VirtualClassTestController.cls

public class VirtualClassTestController {
	
    @auraEnabled
    public static MyOverrideClass getClass() {
        return new MyOverrideClass();
    }
}

virtualClassTestController.js

({
	doInit : function(component, event, helper) {
		
        var action = component.get('c.getClass');
        action.setCallback(this, function(response){
           var data = response.getReturnValue();
           component.set('v.dataString', JSON.stringify(data));
        });
        $A.enqueueAction(action);
	}
})