- string vs. list "in" ('a' in 'a' is True, but 'a' in ['a'] is also True) - cannot know which object attributes are private or public (and some classes use se

- string vs. list "in" ('a' in 'a' is True, but 'a' in ['a'] is also True) - cannot know which object attributes are private or public (and some classes use settable properties so you can't say "just don't set any attributes on non-dataclass objects")