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# Objective - Required by #16622 due to differing implementations of `System` by `FunctionSystem` and `ExclusiveFunctionSystem`. - Optimize the memory usage of instances of `apply_deferred` in system schedules. ## Solution By changing `apply_deferred` from being an ordinary system that ends up as an `ExclusiveFunctionSystem`, and instead into a ZST struct that implements `System` manually, we save ~320 bytes per instance of `apply_deferred` in any schedule. ## Testing - All current tests pass. --- ## Migration Guide - If you were previously calling the special `apply_deferred` system via `apply_deferred(world)`, don't. |
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