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Which strategy do you use to sync data? (e.g. in the context of collaborative editing)

Collaborating on different properties of a single object is no problem; for working on the same property we don't do diff/merge yet, it's just FIFO.

So if two users are working on the same textfield there is no way to merge their changes at the moment?

Not yet - unless you do it client-side. We're working on having a proper implementation for this use case.