feat: add strings function

cluster.go

@@ -233,19 +233,14 @@ func setupClusterQueryParams(u *url.URL, o *ClusterOptions) (*ClusterOptions, er
 	}
 
 	// addr can be specified as many times as needed
-	addr := q.string("addr")
-	for addr != "" {
+	addrs := q.strings("addr")
+	for _, addr := range addrs {
 		h, p, err := net.SplitHostPort(addr)
 		if err != nil || h == "" || p == "" {
 			return nil, fmt.Errorf("redis: unable to parse addr param: %s", addr)
 		}
 
 		o.Addrs = append(o.Addrs, net.JoinHostPort(h, p))
-
-		addr = q.string("addr")
-		if q.err != nil {
-			return nil, q.err
-		}
 	}
 
 	// any parameters left?

options.go

@@ -301,20 +301,18 @@ type queryOptions struct {
 }
 
 func (o *queryOptions) string(name string) string {
-	if len(o.q[name]) == 0 {
+	vs := o.q[name]
+	if len(vs) == 0 {
 		return ""
 	}
-	// get the first item from the array to return
-	// and remove it so it isn't processed again
-	param := o.q[name][0]
-	o.q[name] = o.q[name][1:]
-
-	// remove the key to enable detection of unknown params
-	if len(o.q[name]) == 0 {
-		delete(o.q, name)
+	delete(o.q, name) // enable detection of unknown parameters
+	return vs[len(vs)-1]
 }
 
-	return param
+func (o *queryOptions) strings(name string) []string {
+	vs := o.q[name]
+	delete(o.q, name)
+	return vs
 }
 
 func (o *queryOptions) int(name string) int {