Wed, 02 Oct 2019 22:01:04 +0200 wenzelm prefer atomic edits -- potentially more robust;
Wed, 02 Oct 2019 21:27:51 +0200 wenzelm clarified signature -- potentially more robust;
Wed, 02 Oct 2019 20:58:09 +0200 wenzelm just one dump_checkpoint Main -- potentially more robust;
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