Photon Bolt - Syncing a dictionary variable (Block building game)

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So far as I can gather in Photon Bolt you have to sync variables with custom states. The problem is that I'm making a 3D block building game.

I really don't want to destroy my data usage having to sync an entire 3D integer array every time a block is placed or destroyed so I'd rather use a dictionary but state's don't seem to support dictionaries.

Any thoughts?

Edit: It also just occurred to me, I don't think Bolt states let you sync 3D array's anyway, only 1D.