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safeCall basically keeps calls safe when they are being executed asynchronously, that is, if the calls inside safeCall are being executed in a thread other than the dispatcher, they will simply be sent to that thread, thus avoiding concurrency.
What I just wrote is already being done with tryAddEvent, but it is not a very intuitive name, and it is visually polluted. In the safeCall method, besides being short, you can simply send 'this' as a parameter to the lambda, without having to fear that its execution will be done when the reference no longer exists, because inside safeCall, there is a reference check, if it has already been destroyed, it will simply not be executed.