What is "Option[system.bool]"?

[shirleyquirk]

you will sometimes see types in error messages in their fully-qualified 
`module.type` form. so `system.int` or `system.bool` are exactly the standard 
int, bool types.

it looks like you're trying to use `telebot`? if my guess is correct, there's 
an example of how to set chat permissions in the repo 
[here](https://github.com/ba0f3/telebot.nim/blob/master/examples/set_chat_permissions.nim)
    
    
    import ../telebot, asyncdispatch, logging, options, sam
    from strutils import strip
    
    import ../telebot/utils
    
    var L = newConsoleLogger(fmtStr="$levelname, [$time] ")
    addHandler(L)
    
    const API_KEY = slurp("secret.key").strip()
    
    proc commandHandler(b: Telebot, c: Command) {.async.} =
      let perms = ChatPermissions(
        canSendMessages: some(true),
        canSendMediaMessages: some(true),
        canSendOtherMessages: some(true),
        canAddWebPagePreviews: some(true))
      
      var json  = ""
      marshal(perms, json)
      echo json
      discard await restrictChatMember(b, $c.message.chat.id, 50535480, perms)
      
      discard await getChatMember(b, $c.message.chat.id, 50535480)
    
    
    when isMainModule:
      let bot = newTeleBot(API_KEY)
      bot.onCommand("perms", commandHandler)
      bot.poll(timeout=300)
    
    
    Run