[Pharo-project] instVarNames vs instVarNamed:

may be this is too early but I wanted to change the value of a class instance variable Nautilus class instVarNames -> #('maxSize' 'cachedLastClasses' 'groups') Nautilus class instVarNamed: 'groups' -> error Nautilus instVarNamed: 'groups' worked I found that strange and inconsistent. I'am wrong? Stef