def __bytes__(self):
if self.strict:<EOL><INDENT>return bytes(self.bfr)<EOL><DEDENT>else:<EOL><INDENT>return bytes(self.bfr[:self.length])<EOL><DEDENT>
Return immutable copy of buffer
        In strict mode, return entire pre-allocated buffer, initialized
        to 0x00 where not overwritten.
        In non-strict mode, return only written bytes.