Bump to v4.10.0.

_stringSize.js

@@ -1,4 +1,4 @@
-define([], function() {
+define(['./_reHasComplexSymbol'], function(reHasComplexSymbol) {
 
   /** Used to compose unicode character classes. */
   var rsAstralRange = '\\ud800-\\udfff',
@@ -26,9 +26,6 @@ define([], function() {
   /** Used to match [string symbols](https://mathiasbynens.be/notes/javascript-unicode). */
   var reComplexSymbol = RegExp(rsFitz + '(?=' + rsFitz + ')|' + rsSymbol + rsSeq, 'g');
 
-  /** Used to detect strings with [zero-width joiners or code points from the astral planes](http://eev.ee/blog/2015/09/12/dark-corners-of-unicode/). */
-  var reHasComplexSymbol = RegExp('[' + rsZWJ + rsAstralRange  + rsComboMarksRange + rsComboSymbolsRange + rsVarRange + ']');
-
   /**
    * Gets the number of symbols in `string`.
    *