Comment (by Roland Haas):

Not sure if that test ever actually tested for NaNs. At least `git log -G [Nn][Aa][Nn]' does not find anything. There is a test in NaNChecker that had to use some extra code to produce NaNs for it to find in git hash 837d426 "NaNChecker: use internally generated NaNs in test case" of cactusutils .

Should be enough to have a regex looking for nan and [+-]inf where the current regex expects the numeric part I suspect and (possibly) some extra code in the C++ code to convert those to NaN and inf, if that is not automatically done by the routine used to convert real number strings to double values.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/1278/handle-inf-and-nan-in-parameter-file