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Bug in nlm, found using sem; failure in several flavors (PR#13883)

A wild guess, based on some recent "non-deterministic" behavior in
lme4: could this be driven by a bug in optimized linear algebra libraries
(BLAS/LAPACK)?  (Unfortunately, I'm not clear on how to check the versions
of BLAS/LAPACK being used and whether they are subject to bugs,
but perhaps someone else can comment ...)

   Ben Bolker
Adam D. I. Kramer-2 wrote: