Setting Integer and Bool values in triggers

I'm making a new message trigger that should set an extra field on a ticket/request. for extra fields of type String this works as expected, but for Integer and Boolean I'm unable to set the value:

  Integer ticketId = Integer(ed.getInputValue("outbox.ticketId"));
  NSTicketAgent ticketAgent;
  NSTicketEntity ticket = ticketAgent.GetTicketEntity(ticketId);
  Map extras;
  extras.insert("x_snorre", "string value inserted");    //works
  extras.insert("x_snorre2", "34");       //don't work
  extras.insert("x_snorre2", "[34]");     //don't work
  extras.insert("x_snorre2", "[I:34]");   //don't work
  ticket.SetExtraFields(extras);
  ticketAgent.SaveTicketEntity(ticket);

Any suggestions?