Steps to reproduce

1. Create a component which has a double field within a jcrMultiField:
   component.yaml

   form:
     properties:
       myField:
         label: My Field
         $type: jcrMultiValueField
         itemProvider:
           class: info.magnolia.ui.editor.MultiValueAsMultipleProperties$Definition
         field:
           name: number
           label: ' '
           $type: textField
           type: java.lang.Double
           converterClass: com.vaadin.data.converter.StringToDoubleConverter 

2.  Create the component and save a Double value within the number field
3. Check at JCR that the value has been stored as String instead of Double

Expected results

Just as happens for simple fields as Textfield, the value is stored as Double

Actual results

The value is stored as String

Workaround

N/A

Development notes

N/A