[RFC] Stringify a thread

I'm considering a one line addition to the threads module to overload
the string value of a thread to return its ID:

  '""' => sub { shift->tid() }

Since thread IDs are unique, thread objects could be used as hash keys
in a more rational way:

  $timeouts{$thr} = $secs;

Also, it would also simply such things as:

  print("Thread $thr running...\n");

Comments?

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