n</span><span class="p">(</span><span class="s">&#39;Warning (severe): </span><span class="si">%s</span><span class="s">.is_equiv(</span><span class="si">%s</span><span class="s">) is False, but </span><span class="si">%s</span><span class="s">.same(</span><span class="si">%s</span><span class="s">) is True! &#39;</span> <span class="o">%</span> <span class="p">(</span><span class="bp">self</span><span class="p">,</span><span class="n">other</span><span class="p">,</span><span class="bp">self</span><span cl