Mon, 20 Jul 2020 23:45:29 +0200 wenzelm subtle change of Theory_Data extend/merge semantics due to Theory.join_theory;
Fri, 17 Jul 2020 20:35:43 +0200 wenzelm clarified -- avoid non-standard extend/merge;
Fri, 17 Jul 2020 20:22:58 +0200 wenzelm tuned -- avoid non-standard extend;
Fri, 17 Jul 2020 19:10:24 +0200 wenzelm clarified -- avoid non-standard extend/merge;
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