zero/bool.go
func (b Bool) MarshalText() ([]byte, error) {
	if !b.Valid || !b.Bool {
		return []byte("false"), nil
	}
	return []byte("true"), nil
}
func (b Bool) MarshalText() ([]byte, error) {
	if !b.Valid || !b.Bool {
		return []byte("false"), nil
	}
	return []byte("true"), nil
}
// MarshalText implements encoding.TextMarshaler.
// It will encode a zero if this Bool is null.