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# Objective `QueryState::is_empty` is unsound, as it does not validate the world. If a mismatched world is passed in, then the query filter may cast a component to an incorrect type, causing undefined behavior. ## Solution Add world validation. To prevent a performance regression in `Query` (whose world does not need to be validated), the unchecked function `is_empty_unsafe_world_cell` has been added. This also allows us to remove one of the last usages of the private function `UnsafeWorldCell::unsafe_world`, which takes us a step towards being able to remove that method entirely. |
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| .. | ||
| entity | ||
| query | ||
| reflect | ||
| schedule | ||
| storage | ||
| system | ||
| world | ||
| archetype.rs | ||
| bundle.rs | ||
| change_detection.rs | ||
| component.rs | ||
| event.rs | ||
| lib.rs | ||
| removal_detection.rs | ||