anchor.diff:      inherit Attribute()
   
   /// Compile union types as string literals.
  -/// More info: http://fable.io/docs/interacting.html#StringEnum-attribute
  +/// More info: https://fable.io/docs/communicate/js-from-fable.html#stringenum-attribute
   [<AttributeUsage(AttributeTargets.Class)>]
   type StringEnumAttribute(caseRules: CaseRules) =
       inherit Attribute()
  
positive.code:     static member op_ErasedCast(x:'e) = Case5 x
  
  /// Erased union type to represent one of six possible values.
  /// More info: http://fable.io/docs/interacting.html#Erase-attribute
  type [<Erase>] U6<'a, 'b, 'c, 'd, 'e, 'f> =
      | Case1 of 'a
      | Case2 of 'b
  
negative.code:     static member op_ErasedCast(x:'b) = Case2 x
  
  /// Erased union type to represent one of three possible values.
  /// More info: https://fable.io/docs/communicate/js-from-fable.html#erase-attribute
  type [<Erase>] U3<'a, 'b, 'c> =
      | Case1 of 'a
      | Case2 of 'b
  