This expiration tag was recently added I assume, for such reason we missed that one out 😅
It was merged into the NIP repository December 4th 2022, so not recent at all.
Please add support for it, it would be very helpful: https://github.com/nostr-protocol/nips/blob/master/40.md
Please add support for it, it would be very helpful: https://github.com/nostr-protocol/nips/blob/master/40.md
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