typed.go
func (t Typed) IntMust(key string) int {
	i, exists := t.IntIf(key)
	if exists == false {
		panic("expected int value for " + key)
	}
	return i
}
func (t Typed) IntMust(key string) int {
	i, exists := t.IntIf(key)
	if exists == false {
		panic("expected int value for " + key)
	}
	return i
}
// Returns an int or panics