They do appear to be "hidden" as I see them in wp_postmeta being stored as meta_key and meta_value. For example, one is meta_key : _enginetype and the meta_value was entered as "Gas". But they are not hidden in the post entry screen (as the codex says above) – they're there for data entry. So are they truly "hidden" since I can enter data into them on the post edit screen? I'm confused. Would I be able to "unhide" them somehow?
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