Added new round(n) function.

Rationale: Using unrounded computed widths leads to pixel errors.

lib/less/functions.js

@@ -130,6 +130,18 @@ tree.functions = {
         }
         str = str.replace(/%%/g, '%');
         return new(tree.Quoted)('"' + str + '"', str);
+    },
+    round: function (n) {
+        if (n instanceof tree.Dimension) {
+            return new(tree.Dimension)(Math.round(number(n)), n.unit);
+        } else if (typeof(n) === 'number') {
+            return Math.round(n);
+        } else {
+	    throw {
+                error: "RuntimeError",
+                message: "math functions take numbers as parameters"
+            };
+        }
     }
 };
 

test/css/functions.css

@@ -20,6 +20,8 @@
   hue: 98;
   saturation: 12%;
   lightness: 95%;
+  rounded: 11;
+  roundedpx: 3px;
 }
 #alpha {
   alpha: rgba(153, 94, 51, 0.6);

test/less/functions.less

@@ -24,6 +24,8 @@
   hue: hue(hsl(98, 12%, 95%));
   saturation: saturation(hsl(98, 12%, 95%));
   lightness: lightness(hsl(98, 12%, 95%));
+  rounded: round(@r/3);
+  roundedpx: round(10px / 3);
 }
 
 #alpha {