If I use a Slider field in a content app and define a content type for this content, I get an error if I set the content-type type as Double and also if I use the default configuration.

Steps to reproduce

1. Create a content app and the content-type definition(yaml files attached):
   App definition

   !content-type:news
   name: News 2
   subApps:
     detail:
       form:
         properties: !override
           jcrName:
           order:
             $type: sliderField
             defaultValue: 50
   

   Content type definition

   datasource:
     workspace: news
     rootPath: /
     autoCreate: true
   model:
     nodeType: mgnl:news
     properties:
       - name: order
       - type: Double
   

1. Open the new content app and try to change the slider. And error comes up.

Expected result

Slider is working and the value can be changed and saved

Actual result

An error comes up:

Message: java.lang.String cannot be cast to java.lang.Double. Stack trace: 
java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Double

Workaround

• do not specify the type in the content type definition, just to use the default one.
• add property type: java.lang.Double in the slider field definition

Development notes

JCR form binding mechanism should do auto-conversion for the primitive types, but it seems not happening in this case.