typed.go
func (t Typed) Bools(key string) []bool {
	return t.BoolsOr(key, nil)
}
func (t Typed) Bools(key string) []bool {
	return t.BoolsOr(key, nil)
}
func ( t Typed ) Bools ( key string ) [ ] bool { return t . BoolsOr ( key , nil ) }
// Returns an slice of boolean, or an nil slice
Returns an slice of boolean or an nil slice