Comment (by Roland Haas):

I woukd say @Erik Schnetter will have to weigh in on this one. Caroet does not actually itself know the timestep initially and squirrels it away when it is first set by thorn Time. Assuming basedelfa to be 1.0 does seem wrong though.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2639/carpetlib-internal-error-with-presync-and