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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def save(self, destination: BinaryIO, buffer_size: int=16384) -> None: """Save the file to the destination. Arguments: destination: A filename (str) or file object to write to. buffer_size: Buffer size as used as length in :func:`shutil.copyfileobj`. """

        close_destination = False
        if isinstance(destination, str):
            destination = open(destination, 'wb')
            close_destination = True
        try:
            copyfileobj(self.stream, destination, buffer_size)
        finally:
            if close_destination:
                destination.close()