Mon, 17 May 2021 20:37:42 +0200 wenzelm redundant: tmp_dir is purged anyway;
Mon, 17 May 2021 20:32:52 +0200 wenzelm misc tuning and clarification;
Mon, 17 May 2021 16:15:25 +0200 wenzelm clarified modules;
Mon, 17 May 2021 15:01:37 +0200 wenzelm tuned --- clarified corner cases;
Mon, 17 May 2021 14:54:03 +0200 wenzelm more uniform use of Properties.Eq.unapply, with slightly changed semantics in boundary cases;
Mon, 17 May 2021 14:07:51 +0200 wenzelm clarified signature -- avoid odd warning about scala/bug#6675;
Mon, 17 May 2021 14:07:13 +0200 wenzelm tuned;
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