code: def parse_interval_argument(interval: str | timedelta) -> str:
      """Parse the interval argument as a Polars duration string."""
      if isinstance(interval, timedelta):
          return _timedelta_to_pl_duration(interval)
  
      if " " in interval:
          interval = interval.replace(" ", "")
      return interval.lower()
  
label_desc: Use image node_id 1 for calling a global function with example usage: parse_interval_argument(interval) and returns: interval, _timedelta_to_pl_duration