-gboolean magic_is_valid_or_null(const glui32 goodmagic, const glui32 realmagic, const gchar *function);
-gboolean magic_is_valid(const void *obj, const glui32 goodmagic, const glui32 realmagic, const gchar *function);
+G_GNUC_INTERNAL gboolean magic_is_valid_or_null(const glui32 goodmagic, const glui32 realmagic, const gchar *function);
+G_GNUC_INTERNAL gboolean magic_is_valid(const void *obj, const glui32 goodmagic, const glui32 realmagic, const gchar *function);