* Skip function for es5-shim module.
*
* Test for strict mode as a proxy for full ES5 function support (but not syntax)
- * Per http://kangax.github.io/compat-table/es5/ this is a reasonable short-cut
- * that still allows this to be as short as possible (there are no function "No"s
- * for non-"obsolete" real browsers where strict support is available).
+ * Per http://kangax.github.io/compat-table/es5/ this is a reasonable shortcut
+ * that still allows this to be as short as possible (there are no browsers we
+ * support that have strict mode, but lack other features).
*
- * 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).
*/
return ( function () {
'use strict';
- return !this;
+ return !this && !!Function.prototype.bind;
}() );