def _shrinkBuffer(self):
        """Gets rid of already read data (since we can't rewind)."""
        if self._shrinkThreshold >= self._pos:
            self._buf = self._buf[self._pos:]
            self._avail -= self._pos
            self._pos = 0

            assert self._avail >= 0
dataset/ETHPy150Open edgewall/trac/trac/web/_fcgi.py/InputStream._shrinkBuffer/swapped operands of `>=`