Wed, 10 Sep 2008 21:50:30 +0200 wenzelm replaced join_all by join_results, which returns Exn.results;
Wed, 10 Sep 2008 20:28:01 +0200 wenzelm workers: explicit activity flag;
Wed, 10 Sep 2008 19:44:29 +0200 wenzelm future: allow explicit group;
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