Thu, 22 Mar 2018 16:39:22 +0100 wenzelm clarified exported messages, e.g. suppress "information", "tracing";
Thu, 22 Mar 2018 16:20:53 +0100 wenzelm clarified signature: prefer selective include_sessions;
Thu, 22 Mar 2018 15:11:14 +0100 wenzelm clarified signature: more uniform session_id;
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