Small optimization to jQuery.prop, saving 2 or 3 bytes

src/jquery/jquery.js

@@ -1281,10 +1281,9 @@ jQuery.extend({
 			var exclude = /z-?index|font-?weight|opacity|zoom|line-?height/i;
 
 			// Handle passing in a number to a CSS property
-			if ( value && value.constructor == Number && type == "curCSS" && !exclude.test(prop) )
-				return value + "px";
-
-			return value;
+			return value && value.constructor == Number && type == "curCSS" && !exclude.test(prop) ?
+				value + "px" :
+				value;
 	},
 
 	className: {