72     // 1.Let to be ToObject(target).  in Assign()
79     // 4.Let sources be the List of argument values starting with the second argument.  in Assign()
81     //   a.If nextSource is undefined or null, let keys be an empty List.  in Assign()
83     //     i.Let from be ToObject(nextSource).  in Assign()
84     //     ii.Let keys be from.[[OwnPropertyKeys]]().  in Assign()
98             //    i.Let desc be from.[[GetOwnProperty]](nextKey).  in Assign()
101             //      1.Let propValue be Get(from, nextKey).  in Assign()
103             //      3.Let status be Set(to, nextKey, propValue, true).  in Assign()
147     // 2.Let props be ToObject(Properties).  in ObjectDefineProperties()
153     // 4.Let keys be props.[[OwnPropertyKeys]]().  in ObjectDefineProperties()
159     // 6.Let descriptors be an empty List.  in ObjectDefineProperties()
166     //   a.Let propDesc be props.[[GetOwnProperty]](nextKey).  in ObjectDefineProperties()
169     //     i.Let descObj be Get( props, nextKey).  in ObjectDefineProperties()
171     //     iii.Let desc be ToPropertyDescriptor(descObj).  in ObjectDefineProperties()
196             //   a.Let P be the first element of pair.  in ObjectDefineProperties()
197             //   b.Let desc be the second element of pair.  in ObjectDefineProperties()
198             //   c.Let status be DefinePropertyOrThrow(O,P, desc).  in ObjectDefineProperties()
227     // 2.Let obj be ObjectCreate(O).  in Create()
266     // 2.Let key be ToPropertyKey(P).  in DefineProperty()
272     // 4.Let desc be ToPropertyDescriptor(Attributes).  in DefineProperty()
279     // 6.Let success be DefinePropertyOrThrow(O,key, desc).  in DefineProperty()
303     // 2.Let status be SetIntegrityLevel( O, "frozen").  in Freeze()
327     // 1.Let obj be ToObject(O).  in GetOwnPropertyDescriptor()
334     // 3.Let key be ToPropertyKey(P).  in GetOwnPropertyDescriptor()
341     // 5.Let desc be obj.[[GetOwnProperty]](key).  in GetOwnPropertyDescriptor()
358     // 1.Let obj be ToObject(O).  in GetOwnPropertyKeys()
365     // 3.Let keys be obj.[[OwnPropertyKeys]]().  in GetOwnPropertyKeys()
371     // 5.Let nameList be a new empty List.  in GetOwnPropertyKeys()
445     // 1.Let obj be ToObject(O).  in GetPrototypeOf()
528     // 1. Let obj be ToObject(O).  in Keys()
536     // 3. Let nameList be EnumerableOwnNames(obj).  in Keys()
555     // 1. Let obj be ToObject(O).  in Values()
562     // 3. Let nameList be ? EnumerableOwnPropertyNames(obj, value).  in Values()
585     // 2. Let status be O.[[PreventExtensions]]().  in PreventExtensions()
618     // 2. Let status be SetIntegrityLevel(O, "sealed").  in Seal()
642     // 1. Let O be RequireObjectCoercible(O).  in SetPrototypeOf()
661     // 5. Let status be O.[[SetPrototypeOf]](proto).  in SetPrototypeOf()
686     // 1. Let P be ToPropertyKey(V).  in HasOwnProperty()
693     // 3. Let O be ToObject(this value).  in HasOwnProperty()
716     // 2. Let O be ToObject(this value).  in IsPrototypeOf()
722     //    a. Let V be V.[[GetPrototypeOf]]().  in IsPrototypeOf()
739     // 1. Let P be ToPropertyKey(V).  in PropertyIsEnumerable()
748     // 3. Let O be ToObject(this value).  in PropertyIsEnumerable()
753     // 5. Let desc be O.[[GetOwnProperty]](P).  in PropertyIsEnumerable()
776     // 1. Let O be the this value.  in ToLocaleString()
793     // 4. Let isArray be IsArray(O).  in GetBuiltinTag()
800     // 6. If isArray is true, let builtinTag be "Array".  in GetBuiltinTag()
804         // 7. Else, if O is an exotic String object, let builtinTag be "String".  in GetBuiltinTag()
809             // 11. Else, if O has a [[BooleanData]] internal slot, let builtinTag be "Boolean".  in GetBuiltinTag()
812             // 12. Else, if O has a [[NumberData]] internal slot, let builtinTag be "Number".  in GetBuiltinTag()
826     // 15. Else, let builtinTag be "Object".  in GetBuiltinTag()
848     // 3. Let O be ToObject(this value).  in ToString()
853     // 16. Let tag be Get (O, @@toStringTag).  in ToString()
863     // 18. If Type(tag) is not String, let tag be builtinTag.  in ToString()
899     // 1.Let obj be ToObject(this value).  in ProtoGetter()
915     // 1. Let O be RequireObjectCoercible(this value).  in ProtoSetter()
932     // 5. Let status be O.[[SetPrototypeOf]](proto).  in ProtoSetter()
965     // 1. Let obj be ? ToObject(O).  in Entries()
969     // 2. Let nameList be ? EnumerableOwnPropertyNames(obj, key+value).  in Entries()
989     // 2. Let obj be ! OrdinaryObjectCreate(%Object.prototype%).  in FromEntries()
996     // 4. Let stepsDefine be the algorithm steps defined in CreateDataPropertyOnObject Functions.  in FromEntries()
997     // 5. Let lengthDefine be the number of non-optional parameters of the function definition in  in FromEntries()
999     // 6. Let adder be ! CreateBuiltinFunction(stepsDefine, lengthDefine, "", « »).  in FromEntries()
1017     // 1. Let O be the this value.  in CreateDataPropertyOnObjectFunctions()
1028     // 4. Let propertyKey be ? ToPropertyKey(key).  in CreateDataPropertyOnObjectFunctions()