[hecs] is a fast, lightweight, and unopinionated archetypal ECS library.

[Version 0.8][hecs-changelog] marks a breaking change to most methods that

previously took a generic type parameter `T: Component`, replacing them with

methods taking type parameters which must be *references to* component types

instead. This resolves a long-standing footgun where users accustomed to writing

`&T` in queries might write `world.get::<&T>`, interpreted by rustc as

referencing the valid component type `&'static T`, resulting in code that

compiles but fails to access the intended component.

[hecs]: https://github.com/Ralith/hecs

[hecs-changelog]: https://github.com/Ralith/hecs/blob/master/CHANGELOG.md#080