docs: def piece_file(input_f, chunk_size):
          """
          Provides a streaming interface to file data in chunks of even size, which
          avoids memoryerrors from loading whole files into RAM to pass to `pieces`.
          """
          chunk = input_f.read(chunk_size)
          total_bytes = 0
          while chunk:
              yield chunk
              chunk = input_f.read(chunk_size)
              total_bytes += len(chunk)