Bot API 5.5

• Bots can now contact users who sent a join request to a chat where the bot is an admin – even if the user never interacted with the bot before.
• Added support for protected content in groups and channels.
• Added support for users posting as a channel in public groups and channel comments.
• Added support for mentioning users by their ID in inline keyboards.
• And more, see the full changelog for details:
https://core.telegram.org/bots/api#december-7-2021


Warning: As previously announced, user identifiers can now have up to 52 significant bits and require a 64-bit integer or double-precision float type to be stored safely.