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783f1b8640
The documentation previously implicitly said in a few places that interfaces are classed, but reading through the implementation of `GType`, I don’t think they are. If they were, the registration of the fundamental `G_TYPE_INTERFACE` in `gobject_init()` would specify `G_TYPE_FLAG_CLASSED`. It only specifies `G_TYPE_FLAG_DERIVABLE`. I think this makes sense, because you can’t subclass an interface. Subclassing is a key property of being classed. Tweak the `GType` tutorial to remove that implicit statement, and expand the documentation for `G_TYPE_IS_CLASSED`. Signed-off-by: Philip Withnall <pwithnall@endlessos.org> Fixes: #252