fixed nitpicks

cassandra/config.go

@@ -42,6 +42,8 @@ var ConfigDefault = Config{
 	Consistency:    gocql.Quorum,
 	Reset:          false,
 	Expiration:     10 * time.Minute,
+	MaxRetries:     3,
+	ConnectTimeout: 5 * time.Second,
 }
 
 // configDefault applies `ConfigDefault` values to a user‑supplied Config.
@@ -78,5 +80,13 @@ func configDefault(config ...Config) Config {
 		cfg.Expiration = 0
 	}
 
+	if cfg.MaxRetries == 0 {
+		cfg.MaxRetries = ConfigDefault.MaxRetries
+	}
+
+	if cfg.ConnectTimeout == 0 {
+		cfg.ConnectTimeout = ConfigDefault.ConnectTimeout
+	}
+
 	return cfg
 }