#1237 (Jul 21, 2020, 2:01:27 AM)

1. subtle change of Theory_Data extend/merge semantics due to Theory.join_theory;
   explicitly check for extend as identity; (detail / hgweb)

Started by an SCM change

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• 1 hr 11 min waiting;
• 1 hr 26 min build duration;
• 2 hr 38 min total from scheduled to completion.