addressable(kind: number): boolean
Events are addressable, which means that, for each combination of pubkey, kind and the d tag, only the latest event is expected to be stored by relays, older versions are expected to be discarded.
Events are ephemeral, which means they are not expected to be stored by relays.
parameterizedReplaceable(kind: number): boolean
Events are regular, which means they're all expected to be stored by relays.
replaceable(kind: number): boolean
Events are replaceable, which means that, for each combination of pubkey and kind, only the latest event is expected to (SHOULD) be stored by relays, older versions are expected to be discarded.