use spec-internal enum in GetOwnPropertyKeys AO

spec.html

@@ -25844,26 +25844,26 @@ <h1>Object.getOwnPropertyDescriptors ( _O_ )</h1>
         <h1>Object.getOwnPropertyNames ( _O_ )</h1>
         <p>When the `getOwnPropertyNames` function is called, the following steps are taken:</p>
         <emu-alg>
-          1. Return ? GetOwnPropertyKeys(_O_, String).
+          1. Return ? GetOwnPropertyKeys(_O_, ~string~).
         </emu-alg>
       </emu-clause>
 
       <emu-clause id="sec-object.getownpropertysymbols">
         <h1>Object.getOwnPropertySymbols ( _O_ )</h1>
         <p>When the `getOwnPropertySymbols` function is called with argument _O_, the following steps are taken:</p>
         <emu-alg>
-          1. Return ? GetOwnPropertyKeys(_O_, Symbol).
+          1. Return ? GetOwnPropertyKeys(_O_, ~symbol~).
         </emu-alg>
 
         <emu-clause id="sec-getownpropertykeys" aoid="GetOwnPropertyKeys">
           <h1>Runtime Semantics: GetOwnPropertyKeys ( _O_, _type_ )</h1>
-          <p>The abstract operation GetOwnPropertyKeys is called with arguments _O_ and _type_ where _O_ is an Object and _type_ is one of the ECMAScript specification types String or Symbol. The following steps are taken:</p>
+          <p>The abstract operation GetOwnPropertyKeys is called with arguments _O_ and _type_ where _O_ is an Object and _type_ is one of ~string~ or ~symbol~. The following steps are taken:</p>
           <emu-alg>
             1. Let _obj_ be ? ToObject(_O_).
             1. Let _keys_ be ? _obj_.[[OwnPropertyKeys]]().
             1. Let _nameList_ be a new empty List.
             1. For each element _nextKey_ of _keys_ in List order, do
-              1. If Type(_nextKey_) is _type_, then
+              1. If Type(_nextKey_) is Symbol and _type_ is ~symbol~ or Type(_nextKey_) is String and _type_ is ~string~, then
                 1. Append _nextKey_ as the last element of _nameList_.
             1. Return CreateArrayFromList(_nameList_).
           </emu-alg>