fixing a subtle bug in With()

logger/wrappedslogger.go

@@ -89,9 +89,13 @@ func (wl *WrappedSlogger) Trace(msg string, fields watermill.LogFields) {
 
 func (wl *WrappedSlogger) With(fields watermill.LogFields) watermill.LoggerAdapter {
 	attrs := LogFieldsToSlogAttrs(fields)
+	loggerArgs := make([]any, len(attrs))
+	for idx, attr := range attrs {
+		loggerArgs[idx] = attr
+	}
 	newLoggers := make([]*slog.Logger, 0)
 	for _, l := range wl.loggers {
-		newLoggers = append(newLoggers, l.With(attrs))
+		newLoggers = append(newLoggers, l.With(loggerArgs...))
 	}
 	return &WrappedSlogger{loggers: newLoggers}