Comment (by Roland Haas):

As a suggestion: there is a Cactus parameter

Cactus::schedule_sort_mode = "descending"

also "non", the default, or "ascending".

Which can be used to willfully change the ordering of scheduled functions without any explicit AFTER or BEFORE relation. A correctly written schedule.ccl should be unaffected. While one that relies on accidental order would fail.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2929/grhaylet-illinoisgrmhd