Ticket #929 (enhancement)

In _cprequest.py, class Response:

    def collapse_body(self):
        """Collapse self.body to a single string; replace it and return it."""
        newbody = ''.join([chunk for chunk in self.body])
        self.body = newbody
        return newbody

If response.body is a large string, this function generates a lot of heat performing a no-op. An isinstance(self.body, basestring) test could avoid that.