Checking if a device is already in an array of devices?

Development Programming & Scripting Verse
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1

I have an array of NPC Spawners. This array has duplicates of the same spawner. I would like to subscribe to the EliminatedEvent event for each spawner only once.

As such, I have created an additional array for spawn devices that I have already tracked.

Currently I have:

var trackedSpawnDevices : []npc_spawner_device = array{}
        for (SpawnDevice : WaveData):
            if (trackedSpawnDevices.Find[SpawnDevice]):
                Print("Already here!")
            else:
                set trackedSpawnDevices += array{SpawnDevice}
                SpawnDevice.EliminatedEvent.Subscribe(OnNPCEliminated)

However, I get an error when I try to find the SpawnDevice in the array with Find:

This function parameter expects a value of type tuple(comparable,comparable), but this argument is an incompatible value of type tuple(npc_spawner_device,npc_spawner_device).

I presume this means that I cannot find a device in an array this way. I then tried to loop through the array manually and check if the current item in the array is the same as the one I am checking, but it gives me a similar error.

Is this possible?