Oh my god, have I created Skynet!? 😂 In theory, the AI simply adds all cards in hand that match the current value to an array. Then, if it has any, it discards a random number of them, and only them. So, if it has the card, in theory, it should tell the truth. I was trying to create something more interesting at the end, with some different simple strategies, like aggressive or suspicious, but I did not have time and rolled back to the simple one. So it's not the most engaging opponent, but it should not be a filthy liar!
The current value is indeed small, and maybe the actual card image could be signaling instead of a small number?
Anyway, many thanks for the feedback and your kind words. I'm very glad you enjoyed it!