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;
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