turn nil immediately. Otherwise, returns nil. Available flags:

* `:n` - return immediately
* `:t` - set the task-id of the new thread to value. The task-id is passed in messages to the supervisor channel.
* `:a` - don't copy abstract registry to new thread (performance optimization)
* `:c` - don't copy cfunction registry to new thread (performance optimization)</pre><a href="https://janetdocs.org/ev/thread">Community Examples</a></div><hr><div class="binding"><span id="ev/thread-chan" class="binding-sym">e