Symbol: luai_numisnan
usr/src/uts/common/fs/zfs/lua/lcode.c
330
if (r == 0 || luai_numisnan(NULL, r)) { /* handle -0 and NaN */
usr/src/uts/common/fs/zfs/lua/ltable.c
408
else if (ttisnumber(key) && luai_numisnan(L, nvalue(key)))