Make sure that data functions return 0 instead of -0 for a number of...

src/date-delay.js

Index: src/date-delay.js
===================================================================
--- src/date-delay.js	(revision 730)
+++ src/date-delay.js	(working copy)
@@ -50,6 +50,8 @@
 // ECMA 262 - 5.2
 function Modulo(value, remainder) {
   var mod = value % remainder;
+  // Guard against returning -0.
+  if (mod == 0) return 0;
   return mod >= 0 ? mod : mod + remainder;
 }