Tue, 28 Feb 2023 17:16:50 +0100 wenzelm tuned;
Tue, 28 Feb 2023 17:12:39 +0100 wenzelm simplified somewhat pointless error message (see also 0189fe0f6452);
Tue, 28 Feb 2023 16:25:23 +0100 wenzelm clafified signature: simplify object-oriented reuse;
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