Refactor to aid optimization of non-try/catch code.

index.js

@@ -1,14 +1,17 @@
 'use strict';
 
 var strValue = String.prototype.valueOf;
-
-module.exports = function isString(value) {
-	if (typeof value === 'string') { return true; }
-	if (typeof value !== 'object') { return false; }
+var tryStringObject = function tryStringObject(value) {
 	try {
 		strValue.call(value);
 		return true;
 	} catch (e) {
 		return false;
 	}
 };
+
+module.exports = function isString(value) {
+	if (typeof value === 'string') { return true; }
+	if (typeof value !== 'object') { return false; }
+	return tryStringObject(value);
+};