telekUserId

Who sent it, null when nothing did that telek can name — a channel post, an automatic forward. A Keying that wants a per-person key falls back to the chat in that case; see io.github.youndie.telek.ConversationKey.

A dev.inmo.tgbotapi.types.chat.User IS a chat in ktgbotapi's model (User : PrivateChat), so its id unwraps through exactly the same value classes as telekChatId does.