@codebrainz commented on this pull request.

In HACKING:

> @@ -219,6 +219,10 @@ Coding
   ``gint``, use a ``gchar`` for individual (ASCII/UTF-8) string
   characters rather than ``gint``, and use a ``guint`` for integers
   which cannot be negative rather than ``gint``.
+* Avoid using untyped pointers (e.g. gpointer) where practical.
+* Prefer loops to calling *_foreach() with a non-NULL untyped 
+  ``user_data`` pointer parameter, unless external iteration is not 
+  supported (e.g. for tree structures).

This is a bit confusing IMO. Maybe it would read better by just dropping the with a non-NULL untyped user_data pointer parameter? Even without that part, it's still a useful guideline and not overly specific.

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