Thu, 10 Dec 2020 16:47:06 +0100 wenzelm clarified: omit presumably pointless Markup.Serial (see also 0b9334adcf05);
Thu, 10 Dec 2020 16:35:56 +0100 wenzelm clarified signature: more specific types;
Thu, 10 Dec 2020 15:27:41 +0100 wenzelm tuned messages;
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