docs: def env_list(name, separator=',', required=False, default=empty):
      """Pulls an environment variable out of the environment, splitting it on a
      separator, and returning it as a list. Extra whitespace on the list values
      is stripped. List values that evaluate as falsy are removed. If not present
      and no default specified, an empty list is returned.
  
      :param name: The name of the environment variable be pulled
      :type name: str
  
      :param separator: The separator that the string should be split on.
      :type separator: str
  
      :param required: Whether the environment variable is required. If ``True``
      and the variable is not present, a ``KeyError`` is raised.
      :type required: bool
  
      :param default: The value to return if the environment variable is not
      present. (Providing a default alongside setting ``required=True`` will raise
      a ``ValueError``)
      :type default: bool
      """
      value = get_env_value(name, required=required, default=default)
      if value is empty:
          return []
      # wrapped in list to force evaluation in python 3
      return list(filter(bool, [v.strip() for v in value.split(separator)]))