func (t *TupleType) AddVersion(fields ...Field) {
	t.versions = append(t.versions, fields)
	for _, field := range fields {
		t.fields[field.Name] = len(t.fields)
	}
}
func (t *TupleType) AddVersion(fields ...Field) {
	t.versions = append(t.versions, fields)
	for _, field := range fields {
		t.fields[field.Name] = len(t.fields)
	}
}
// AddVersion adds a version to the tuple type