Bump to v4.7.0.

_getSymbols.js

@@ -2,14 +2,23 @@
 var getOwnPropertySymbols = Object.getOwnPropertySymbols;
 
 /**
- * Creates an array of the own symbol properties of `object`.
+ * Creates an array of the own enumerable symbol properties of `object`.
  *
  * @private
  * @param {Object} object The object to query.
  * @returns {Array} Returns the array of symbols.
  */
-var getSymbols = getOwnPropertySymbols || function() {
-  return [];
-};
+function getSymbols(object) {
+  // Coerce `object` to an object to avoid non-object errors in V8.
+  // See https://bugs.chromium.org/p/v8/issues/detail?id=3443 for more details.
+  return getOwnPropertySymbols(Object(object));
+}
+
+// Fallback for IE < 11.
+if (!getOwnPropertySymbols) {
+  getSymbols = function() {
+    return [];
+  };
+}
 
 export default getSymbols;