code: public function prepend(Decoding ...$decodings): self
      {
          $copy = clone $this;
          array_unshift($copy->stack, ...$decodings);
  
          return $copy;
      }
docs: Return a new instance with the supplied decodings added to the beginning of the stack.
  
  @param Decoding ...$decodings
  @return DecodingList