[TextHandler] separates the group and attribute names with a dot.
[JSONHandler] treats each group as a separate JSON object, with the group name as the key.
-Use [Group] to create a Group Attr from a name and a list of Attrs:
+Use [Group] to create a Group Attr from a name and a list of key-value pairs:
slog.Group("request",
- slog.String("method", r.Method),
- slog.Any("url", r.URL))
+ "method", r.Method,
+ "url", r.URL)
TextHandler would display this group as