In Wayland array can contain only integers.
See how listing of outputs is done. Server creates one global `wl_output` per output, client binds to the global, server sends events with output parameters (list of modes among them) and then event `done` to indicate it stopped sending info about this output. You probably don't want one global per window. I'd go with one global `window_manager` which sends events (one per window) after bind and after creation of window (or on request, depending on your needs).
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