Editorial: Use [[StringData]] to identify strings in `%Object_toStr…

…ing%` (#1361)

spec.html

@@ -24599,12 +24599,12 @@ <h1>Object.prototype.toString ( )</h1>
           1. Let _O_ be ! ToObject(*this* value).
           1. Let _isArray_ be ? IsArray(_O_).
           1. If _isArray_ is *true*, let _builtinTag_ be `"Array"`.
-          1. Else if _O_ is a String exotic object, let _builtinTag_ be `"String"`.
           1. Else if _O_ has a [[ParameterMap]] internal slot, let _builtinTag_ be `"Arguments"`.
           1. Else if _O_ has a [[Call]] internal method, let _builtinTag_ be `"Function"`.
           1. Else if _O_ has an [[ErrorData]] internal slot, let _builtinTag_ be `"Error"`.
           1. Else if _O_ has a [[BooleanData]] internal slot, let _builtinTag_ be `"Boolean"`.
           1. Else if _O_ has a [[NumberData]] internal slot, let _builtinTag_ be `"Number"`.
+          1. Else if _O_ has a [[StringData]] internal slot, let _builtinTag_ be `"String"`.
           1. Else if _O_ has a [[DateValue]] internal slot, let _builtinTag_ be `"Date"`.
           1. Else if _O_ has a [[RegExpMatcher]] internal slot, let _builtinTag_ be `"RegExp"`.
           1. Else, let _builtinTag_ be `"Object"`.