it's even mentioned in NIP-01 but nobody seems to consider it a mandatory feature for NIP-01 compliance. IMO, it SHOULD be an OPTIONAL one and there should be a feature flag to signal it.

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I agree it should be optional, but I don't like the flag thing because I might want to offer a paid service (like primal), so I store older versions only for my paying customers. So a flag per relay doesn't make sense in this and many other case. It should just be optional.