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

[Version 0.7](hecs-changelog) introduces several new features, including two new

query combinators, a `CommandBuffer` for recording operations to be applied to a

`World` at a future time, accessors for efficient random access within columns,

and a variant of `EntityBuilder` that clones its components and can therefore be

spawned from repeatedly. Other improvements include compatibility with 32-bit

MIPS and PPC, and introduction of a niche to `Entity` so that

e.g. `Option<Entity>` will not consume additional space.

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

[hecs-changelog]: https://github.com/Ralith/hecs/blob/master/CHANGELOG.md#071