Use isnan instead of isnanf #69
Merged
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The manpage for math.h notes:
https://linux.die.net/man/3/isnanf
"Note that these functions are obsolete. C99 defines macros isfinite(), isinf(), and isnan() (for all types) replacing them."
The C standard documentation here omits isnanf:
https://en.cppreference.com/w/c/header/math
And it seems that many downstream implementations (especially ones for platforms other than Linux) leave it out.