FVREAL
#define isnumber(f) ((f)&(FINT|FVINT|FREAL|FVREAL))
#define isreal(f) ((f)&(FREAL|FVREAL))
(isstring(left->n_flags) && (type_of(left)&FVREAL))) {
(isstring(right->n_flags) && (type_of(right)&FVREAL))) {
return (FSTRING|FVREAL);
np->n_flags = FREAL|FVREAL;