Encode doesn't support expiry tag or signature tag in tags.py enum

[EricPgh]

Performing a sequential decode/encode on an LND invoice throws exceptions. The expiry and signature tags specifically. The Enum in tags.py doesn't appear to be in-spec with the bolt11 spec.

[dni]

hey thanks for using that library :)!

can you be more specific on that or maybe even provide a testcase?

the expiry tag x is here: https://github.com/lnbits/bolt11/blob/main/bolt11/models/tags.py#L18

[EricPgh]

My use case might be a little pointless. I've noticed LND invoices aren't handled well by core, so I was trying to see what was a cause. I'll try to provide a testcase from my CLI when I'm back on that machine. But in more specifics, if a valid invoice comes in, including signature and expiry fields, the bolt11 decode produces those ("signature": and "expiry":) in the JSON structure. Passing the same JSON structure back into bolt11 encode first throws an exception that "expiry" is a bad char (emanating from Line 81 ). If I edit the JSON tag from "expiry" to "expire_time" that exception goes away and then the signature exception shows up (emanating from types.py ). I hope this is more clear for the moment.

Edit
Here's a mt socks invoice (expired) that can show this progression.
lnbc1800u1pj6fnl2pp5ucyqm8yjw0c88kqtpqxjaxdq0txavfu5s30krxcwg5c32nanpmrqdqqcqzzsxqrrs0fppq7czg8plqre836w3w4ea0fcm3p86p2rw3sp5q9pf9f2ar3ze0zxyypzj2yuyzdwqryj662evjtyfavsk333hyvhs9qyyssqye8asutxnxc7ar6tfd24hp2j83zfd20z328mt90g9y7jnaykqz8s960fxkmpty8m6m85kauvnt9q866tt2hk2j9ce4zze8wf3aclh9cprw50al