# Objective
Fixes#18943
## Solution
Reintroduces support for `hashbrown`'s `HashMap` and `HashSet` types.
These were inadvertently removed when `bevy_platform` newtyped the
`hashbrown` types.
Since we removed our `hashbrown` dependency, I gated these impls behind
a `hashbrown` feature. Not entirely sure if this is necessary since we
enabled it for `bevy_reflect` through `bevy_platform` anyways. (Complex
features still confuse me a bit so let me know if I can just remove it!)
I also went ahead and preemptively implemented `TypePath` for `PassHash`
while I was here.
## Testing
You can test that it works by adding the following to a Bevy example
based on this PR (you'll also need to include `hashbrown` of course):
```rust
#[derive(Reflect)]
struct Foo(hashbrown::HashMap<String, String>);
```
Then check it compiles with:
```
cargo check --example hello_world --no-default-features --features=bevy_reflect/hashbrown
```
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