Added compare_to as a standard macro.

lib/std/core/builtin_comparison.c3

@@ -48,6 +48,20 @@ macro greater(a, b) @builtin
 	$endswitch
 }
 
+/**
+ * @require types::is_comparable_value(a) && types::is_comparable_value(b)
+ **/
+macro int compare_to(a, b) @builtin
+{
+	$switch
+	$case $defined(a.compare_to):
+		return a.compare_to(b);
+	$case $defined(a.less):
+		return (int)b.less(a) - (int)a.less(b);
+	$default:
+		return (int)(a > b) - (int)(a < b);
+	$endswitch
+}
 /**
  * @require types::is_comparable_value(a) && types::is_comparable_value(b)
  **/

lib/std/math/math.c3

@@ -131,7 +131,6 @@ macro sign(x)
 	$endif
 }
 
-
 /**
  * @require values::@is_int(x) || values::@is_float(x) "Expected an integer or floating point value"
  * @checked x + y