Geometry: Minor clean up.

src/core/Geometry.js

@@ -661,7 +661,7 @@ THREE.Geometry.prototype = {
 
 			for ( var j = 0, jl = uv.length; j < jl; j ++ ) {
 
-				uvCopy.push( new THREE.Vector2( uv[ j ].x, uv[ j ].y ) );
+				uvCopy.push( uv[ j ].clone() );
 
 			}