Bump to v4.7.0.

_stringToPath.js

@@ -1,3 +1,4 @@
+import memoize from './memoize';
 import toString from './toString';
 
 /** Used to match property names within property paths. */
@@ -13,12 +14,12 @@ var reEscapeChar = /\\(\\)?/g;
  * @param {string} string The string to convert.
  * @returns {Array} Returns the property path array.
  */
-function stringToPath(string) {
+var stringToPath = memoize(function(string) {
   var result = [];
   toString(string).replace(rePropName, function(match, number, quote, string) {
     result.push(quote ? string.replace(reEscapeChar, '$1') : (number || match));
   });
   return result;
-}
+});
 
 export default stringToPath;