Comment (by Erik Schnetter):

I am surprised that there is no consensus about HydroBase; this should be documented in that thorn. Given historic precedence, I would go with the definition used in GRHydro.

HydroBaseX should then use the same definition.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2754/inconsistent-definition-of-b-in-evolution