Bump to v4.0.0.

internal/stringToPath.js

@@ -0,0 +1,25 @@
+define(['../toString'], function(toString) {
+
+  /** Used to match property names within property paths. */
+  var rePropName = /[^.[\]]+|\[(?:(-?\d+(?:\.\d+)?)|(["'])((?:(?!\2)[^\\]|\\.)*?)\2)\]/g;
+
+  /** Used to match backslashes in property paths. */
+  var reEscapeChar = /\\(\\)?/g;
+
+  /**
+   * Converts `string` to a property path array.
+   *
+   * @private
+   * @param {string} string The string to convert.
+   * @returns {Array} Returns the property path array.
+   */
+  function stringToPath(string) {
+    var result = [];
+    toString(string).replace(rePropName, function(match, number, quote, string) {
+      result.push(quote ? string.replace(reEscapeChar, '$1') : (number || match));
+    });
+    return result;
+  }
+
+  return stringToPath;
+});