code: def ensure_a_list(data):
      
      if not data:
          return []
      if isinstance(data, (list, tuple, set)):
          return list(data)
      if isinstance(data, str):
          data = trimmed_split(data)  # settings.toml,other.yaml
          return data
      return [data]
docs: Ensure data is a list or wrap it in a list