Fri, 25 Apr 2014 10:51:57 +0200 wenzelm more explicit checks;
Thu, 24 Apr 2014 23:21:00 +0200 wenzelm tuned signature;
Thu, 24 Apr 2014 23:13:17 +0200 wenzelm more uniform warning/error handling, potentially with propagation to send_wait caller;
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