ref: 5f7a6b7ea3c4ae1b51beffe3309e9b6b0491e71f dir: /sys/src/ape/lib/ap/math/fmin.c/
#include <math.h> double fmin(double a, double b) { if(isNaN(a)) return b; if(isNaN(b)) return a; return a < b ? a : b; }