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Couldn't it be just the first enum item? Zero values are somewhat arbitrary anyway.

I don't think this is a good idea. Because zero value changes when you reorder the fields.

Why would it be just the first enum item? How do you even determine how the enum is ordered?

Source order, presumably?

That's what eg Haskell does, eg when you derive comparisons for sum tyes, they compare by source order.

As does Pascal, Modula-2, Ada, among plenty of others.