Point out some shortcomings of the djb hash, as found in
https://bugzilla.gnome.org/show_bug.cgi?id=751610
* It can be passed to g_hash_table_new() as the @hash_func parameter,
* when using non-%NULL strings as keys in a #GHashTable.
*
+ * Note that this function may not be a perfect fit for all use cases.
+ * For example, it produces some hash collisions with strings as short
+ * as 2.
+ *
* Returns: a hash value corresponding to the key
*/
guint