docs: def dedupe_list(l):
      """Remove duplicates from a list preserving the order.
  
      We might be tempted to use the list(set(l)) idiom, but it doesn't preserve
      the order, which hinders testability and does not work for lists with
      unhashable elements.
      """
      result = []
  
      for el in l:
          if el not in result:
              result.append(el)
  
      return result