o).</li><li>Traces with &quot;UI-thread&quot; status cannot interleave but all other combinations can.</li><li>Top is AnyThread, which means that there are executions on both UI and BG threads on this method.</li><li>Bottom is UnknownThread, and used as initial state.</li></ul></header><dl><dt class="spec type" id="type-t"><a href="#type-t" class="anchor"></a><code><span class="keyword">type</span> t</code><code> = </code><table class="variant"><tr id="type-t.UnknownThread" class="anchored"><td class="def c