code: def set(self, e, k, v, real_k=None, check_kw_name=False):
          
          if self.escape:
              v = v.strip().replace("\\" + self.quote, self.quote)
          return super(kv_transformer, self).set(e, k, v, real_k=real_k, check_kw_name=check_kw_name)
docs: override base to handle escape case: replace \" to "