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Use a fixed state hasher in bevy_reflect for deterministic Reflect::r…
…eflect_hash() across processes (bevyengine#7583) - bevy_ggrs uses `reflect_hash` in order to produce checksums for its world snapshots. These checksums are sent between clients in order to detect desyncronization. - However, since we currently use `async::AHasher` with the `std` feature, this means that hashes will always be different for different peers, even if the state is identical. - This means bevy_ggrs needs a way to get a deterministic (fixed) hash. - ~~Add a feature to use `bevy_utils::FixedState` for the hasher used by bevy_reflect.~~ - Always use `bevy_utils::FixedState` for initializing the bevy_reflect hasher. --- - bevy_reflect now uses a fixed state for its hasher, which means the output of `Reflect::reflect_hash` is now deterministic across processes.
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