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1ffd1cd3dc
* release callback memory early this fixes a memory leak where a deleted callback may keep references alive until the future is finished. In particular, when using helpers like `or` which try to remove themselves from the callback list when a dependent future is completed, create a reference chain between all futures in the expression - in the pathological case where one of the futures is completes only rarely (for example a timeout or a cancellation task), the buildup will be significant. * Removing unnecessary asserts, and place comments instead.