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Enumerations and flags are classed types for Vala, not integers, so they don't fall in the `typeof(G) == typeof(int)` kind of tests. This leads to using the generic code in which Vala assumes pointer-sized elements, which is often not true for enumerations and flags. Add special case for those to use the `int` converters for enumerations and flags. This is most generally correct, but not always: the compiler will likely chose a larger type for a specific enumeration if one of its value is larger than `int`. It would be tempting to use the enumeration's class minimum and maximum values to determine the appropriate type, but unfortunately the API for this uses int itself, so doesn't help. https://bugzilla.gnome.org/show_bug.cgi?id=774669
72671f62
