code: def verify_number_and_cast(x: SupportsFloat) -> float:
      """Verify parameter is a single number and cast to a float."""
      try:
          x = float(x)
      except (ValueError, TypeError):
          raise ValueError(
              f"An option ({x}) could not be converted to a float."
          )
      return x
  
label_desc: Use image node_id 1 for calling a global function with example usage: verify_number_and_cast(x) and returns: x