anchor.diff:          IndexBuffer : Option<ChangeableResource<Buffer>>
           VertexArray : ChangeableResource<VertexArrayObject>
           VertexAttributeValues : Map<int, IMod<Option<V4f>>>
  +        DisposeAllViews : IDisposable
       } 
   
       interface IRenderObject with
  
positive.code: 
  [<AutoOpen>]
  module ``Prepared render object extensions`` =
      let private empty = {
                  Context = Unchecked.defaultof<_>
                  Original = RenderObject.Empty
  
negative.code:                 IndexBuffer = None
                  VertexArray = Unchecked.defaultof<_>
                  VertexAttributeValues = Map.empty
                  DisposeAllViews = noDisposable
              }
  
      type PreparedRenderObject with
  