typed.go
func (t Typed) BoolMust(key string) bool {
	b, exists := t.BoolIf(key)
	if exists == false {
		panic("expected boolean value for " + key)
	}
	return b
}
func (t Typed) BoolMust(key string) bool {
	b, exists := t.BoolIf(key)
	if exists == false {
		panic("expected boolean value for " + key)
	}
	return b
}
// Returns a bool or panics