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