#define FIX2INT(x) ((int)rb_fix2int((VALUE)(x)))
#define NUM2INT_internal(x) (FIXNUM_P(x) ? FIX2INT(x) : (int)rb_num2int(x))
#ifdef __GNUC__
#define NUM2INT(x) \
    __extension__ ({VALUE num2int_x = (x); NUM2INT_internal(num2int_x);})
#else
static inline int
NUM2INT(VALUE x)
{
    return NUM2INT_internal(x);
}
#endif