ception, if the MutableDictionary is modified while it is in use.</p><span class="kdoc-tag"><h4 class="">Return</h4><p class="paragraph">an iterator over the dictionary's keys.</p></span></div><div class="content sourceset-dependent-content" data-togglable=":couchbase-lite/jvmCommonMain"><div class="symbol monospace"><span class="token keyword">actual </span><span class="token keyword">open </span><span class="token keyword">operator override </span><span class="token keyword">fun </span><a href="iterator.h