code: def new_event_type(self, name, mergeable=False):
      ''' Declare a new event. May overwrite an existing entry. '''
  
      self.event_types[name] = self.EventType(name, mergeablef new_event_type(self, name, mergeable=False):
      ''' Declare a new event. May overwrite an existing entry. '''
  
      self.event_types[name] = self.EventType(name, mergeable)
docs: Declare a new event. May overwrite an existing entry.