Function CheckNumber

auxiliary.go:334–340

(l *State, index int)

}

func CheckNumber(l *State, index int) float64 {
	n, ok := l.ToNumber(index)
	if !ok {
		tagError(l, index, TypeNumber)
	}
	return n
}

func OptNumber(l *State, index int, def float64) float64 {
	if l.IsNoneOrNil(index) {