Comment (by Roland Haas):

I don’t know. We generally assume people know what they are doing (they are doing science after all, one assumes a level of care). Outputting a warning all the time just b/c a (documented) parameter is being set, does not seem right.

If a warning is desired I would think a textual warning in param.ccl is sufficient.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2759/twopunctures-swap_xz-results-in-left