VersionedCodable
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Conform `Never` to `VersionedCodable`
Conform Never to VersionedCodable in line with SE-0396.
This might allow for Never to become the 'stopper type' to indicate that there are no earlier versions of a type, replacing NothingEarlier. However, I would still expect NothingEarlier to exist in the package, as something significantly more legible than PreviousVersion = Never.