type URLValues map[string][]string

var urlValuesPool = sync.Pool{
	New: func() interface{} {
		return make(map[string][]string, 10)
	},
}

// NewURLValues returns a new URLValues.
func NewURLValues() *URLValues {
	u := URLValues(urlValuesPool.Get().(map[string][]string))
	return &u
}

// NewURLValuesWith returns a new URLValues with the provided content.