[Rd] Intel Fortran compiler returns a -1 TRUE value

[Ei-ji Nakama]

Hello

> The value generated by Fortran's .TRUE. evaluates as "truthy" -- as in
> all(z[[1]]) -- but is neither equal to nor identical to TRUE. Its numeric
> conversion to -1 is most unusual, every other system I've tried converts to
> +1.

Please read the -fpscomp logicals option of ifort.

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