Way to filter out #undef values from list?

No I didn’t. I said that you shouldn’t (edited…) consider everything about “leaving undefined references in your array” being “bad practice” (that’s what I specifically replied to). I never once mentioned what he want since he didn’t mention and I don’t want to guess. I’m only saying that you shouldn’t just see undefined reference and claim they should all be replaced by missing or nothing and I even agree that unless you need to handle Any (i.e. all types) missing or nothing could be fine.

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