Editorial: Narrow return type of CreateBuiltinFunction

[kimjg1119]

The return type of CreateBuiltinFunction is a function object. However, as indicated by its name, the return type should more specifically be identified as a built-in function object.

This distinction clarifies an operation in ClassDefinitionEvaluation, where MakeConstructor requires either an ECMAScript function object or a built-in function object.

14.b. Let F be CreateBuiltinFunction(defaultConstructor, 0, className, « [[ConstructorKind]], [[SourceText]] », the current Realm Record, constructorParent).
...
16. Perform MakeConstructor(F, false, proto).

cf. It also resolves some ESMeta errors.

ESMeta logs

[ParamTypeMismatch] Call[14206] argument assignment to first parameter _F_ when Call[14181] function call from ClassTail[0,0].ClassDefinitionEvaluation (step 16, 59:20-58) to MakeConstructor
- expected: Record[BuiltinFunctionObject | ECMAScriptFunctionObject]
- actual  : Record[FunctionObject]

[ParamTypeMismatch] Call[14391] argument assignment to first parameter _F_ when Call[14361] function call from ClassTail[0,1].ClassDefinitionEvaluation (step 16, 59:20-58) to MakeConstructor
- expected: Record[BuiltinFunctionObject | ECMAScriptFunctionObject]
- actual  : Record[FunctionObject]

[ParamTypeMismatch] Call[14576] argument assignment to first parameter _F_ when Call[14541] function call from ClassTail[0,2].ClassDefinitionEvaluation (step 16, 59:20-58) to MakeConstructor
- expected: Record[BuiltinFunctionObject | ECMAScriptFunctionObject]
- actual  : Record[FunctionObject]

[ParamTypeMismatch] Call[14761] argument assignment to first parameter _F_ when Call[14721] function call from ClassTail[0,3].ClassDefinitionEvaluation (step 16, 59:20-58) to MakeConstructor
- expected: Record[BuiltinFunctionObject | ECMAScriptFunctionObject]
- actual  : Record[FunctionObject]