- * Note that this will cause IE9 users to get the shim (which should be close to
- * a no-op but will increase page payload).
+ * Do explicitly test for Function#bind because of PhantomJS (which implements
+ * strict mode, but lacks Function#bind).
+ *
+ * IE9 supports all features except strict mode, so loading es5-shim should be close to
+ * a no-op but does increase page payload).