f2d9225101843207188e554a14649f34870380ef
This makes it easy to write custom filters based on the handles. For instance, a user can add pairs of `ColliderHandle`s into a `HashSet` and do a lookup in a `ContactPairFilter` to easily (if maybe not efficiently) disable collisions between pairs of colliders. The same could be accomplished by using the `user_data: u128` field of the `Collider`, but it would be less ergonomic, and also with this PR that `user_data` space can be saved for more important things.
2D and 3D physics engines for the Rust programming language.
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