docs: def save(self, io, little_endian=False):
          """
          Saves the `NBTFile()` to `io`, which can be any file-like object
          providing `write()`.
          """
          if little_endian:
              write = lambda fmt, *args: io.write(pack('<' + fmt, *args))
          else:
              write = lambda fmt, *args: io.write(pack('>' + fmt, *args))
          write.io = io
  
          self.write(write)