anchor.diff:              typeof<V4d>,        4
               typeof<M44f>,       16
   
  +            typeof<C3f>,        3
               typeof<C4f>,        4
               typeof<C4b>,        GL_BGRA
           ] 
  
positive.code:             typeof<V4f>,        typeof<float32>
              typeof<V4d>,        typeof<float>
  
              typeof<C4b>,        typeof<byte>
              typeof<C4f>,        typeof<float>
  
  
negative.code:             typeof<float>, VertexAttribPointerType.Double
  
              typeof<M44f>, VertexAttribPointerType.Float
          ]
  
      // some useful extensions for AttributeDescription
  