Comment (by Miguel Zilhão):

shouldn’t there also be a bug with GetBoundarySizesAndTypes? at the very least, its name is misleading, since i wouldn’t expect a getter function to change any values, and this example seems to show that it acts non-trivially when called…

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2288/leans-boundary-condition-setting-for-bssn