value.go
func NewValueParser(v interface{}) *ValueParser {
	return &ValueParser{
		stack: []reflect.Value{reflect.ValueOf(v)},
	}
}
func NewValueParser(v interface{}) *ValueParser {
	return &ValueParser{
		stack: []reflect.Value{reflect.ValueOf(v)},
	}
}
// NewValueParser creates a new parser that exposes the value v.