re><span class="Keyword">iterator</span> <a href="#keys.i%2CTransaction"><span class="Identifier">keys</span></a><span class="Other">(</span><span class="Identifier">t</span><span class="Other">:</span> <a href="limdb.html#Transaction"><span class="Identifier">Transaction</span></a><span class="Other">)</span><span class="Other">:</span> <span class="Identifier">string</span> {.<span><span class="Other pragmadots">...</span></span><span class="pragmawrap"><span class="Identifier">raises</span><span class="O