more type checking
more type checking

walterbender/turtleflags,max630/turtleart-hacks,walterbender/turtleconfusion,walterbender/turtleart,walterbender/AmazonasTortuga,walterbender/turtleartmini,AlanJAS/turtleart,walterbender/turtle3D,max630/turtleart-hacks