thunderdome 0.2.1

Fast arena allocator with compact generational indices
Documentation 
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# Thunderdome Changelog


## Unreleased Changes


## 0.2.1 (2020-10-01)

* Added `Default` implementation for `Arena`.
* Added `IntoIterator` implementation for `Arena` ([#1](https://github.com/LPGhatguy/thunderdome/issues/1))
* Added `Arena::iter` and `Arena::iter_mut` ([#2](https://github.com/LPGhatguy/thunderdome/issues/2))

## 0.2.0 (2020-09-03)

* Bumped MSRV to 1.34.1.
* Reduced size of `Index` by limiting `Arena` to 2^32 elements and 2^32 generations per slot.
	* These limits should not be hit in practice, but will consistently trigger panics.
* Changed generation counter to wrap instead of panic on overflow.
	* Collisions where an index using the same slot and a colliding generation on [1, 2^32] should be incredibly unlikely.

## 0.1.1 (2020-09-02)

* Added `Arena::with_capacity` for preallocating space.
* Added `Arena::len`, `Arena::capacity`, and `Arena::is_empty`.
* Improved panic-on-wrap guarantees, especially around unsafe code.
* Simplified and documented implementation.

## 0.1.0 (2020-09-02)

* Initial release
* Pretty much completely untested
* You probably shouldn't use this version