scope.Close() in AsyncAfter

shouldn't we close the scope in AsyncAfter since we also opened one?

scope.Close(Undefined());

I assume you mean
return scope.Close(Undefined());

I don't think you need to call scope.Close() unless you want to 'rescue' a handle from destruction from the HandleScope.

In this case, I don't see why you would need to rescue the Undefined handle, it should just be

return Undefined();

// and let scope to clean up whatever handles it likes
the undefined handle won't be cleaned up like other handles, as far as I know.... right?

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