fixup

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

options/options.go

@@ -152,27 +152,24 @@ func ContentType(ct string) Option {
 
 // Metadata pass additional metadata
 func Metadata(md ...any) Option {
-	result := metadata.Metadata{}
+	var result metadata.Metadata
-
+	if len(md) == 1 {
-	if len(md) > 1 {
-		var tmp []string
-		for _, val := range md {
-			switch vt := val.(type) {
-			case string:
-				tmp = append(tmp, vt)
-			default:
-				return func(src interface{}) error {
-					return Set(src, result, ".Metadata")
-				}
-			}
-		}
-		result.Set(tmp...)
-	} else if len(md) == 1 {
 		switch vt := md[0].(type) {
 		case metadata.Metadata:
 			result = metadata.Copy(vt)
 		case map[string]string:
 			result = metadata.Copy(vt)
+		default:
+			result = metadata.New(0)
+		}
+	} else {
+		result = metadata.New(len(md) / 2)
+		for idx := 0; idx < len(md)/2; idx += 2 {
+			k, kok := md[idx].(string)
+			v, vok := md[idx+1].(string)
+			if kok && vok {
+				result.Set(k, v)
+			}
 		}
 	}