Comment (by Roland Haas):

@Zach Etienne could I ask you to review this? It would be important to have the corrected WENO coeffs in the next release and this is complicated enough that a second pair of eyes would be very helpful.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2647/incorrect-weno-coefficient-in-grhydro-weno