docs: def ordered_deduplicate(sequence):
      """
      Returns the sequence as a tuple with the duplicates removed,
      preserving input order.  Any duplicates following the first
      occurrence are removed.
  
      >>> ordered_deduplicate([1, 2, 3, 1, 32, 1, 2])
      (1, 2, 3, 32)
  
      Based on recipe from this StackOverflow post:
      http://stackoverflow.com/a/480227
      """
  
      seen = set()
      # Micro optimization: each call to seen_add saves an extra attribute
      # lookup in most iterations of the loop.
      seen_add = seen.add
  
      return tuple(x for x in sequence if not (x in seen or seen_add(x)))