Is there any way or any trick for checking the type of a parameter from within a
macro?  For example, it would be useful to have a texture apply optionally to a
portion of a union:

#macro Neat_object (Param1, Param2, Texture)
   union
   {  object { ... }
      object
      {  ...
         #if ( /* Texture is really a texture and not the float value 0 */ )
            texture { Texture }
         #end
      }
   }
#end

Since macro arguments must be defined, #ifdef is useless here.  Another common
situation would be passing in a color or a texture:

texture
{  #if ( /* Texture is a vector */ )
      pigment { color Texture }
   #else
      Texture
   #end
}

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