We used 'combo' type for the scheme list. For a while we forgot to add new names, and recently aa0a23ec86 added v241, v243, v245, and v247. I want to allow defining new values during configuration, which means that we can't use meson to verify the list of options. So any value is allowed, but then two tests are added: one that will fail compilation if some invalid name is given (other than "latest"), and one that converts DEFAULT_NET_NAMING_SCHEME to a NamingScheme pointer.
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