panicking when the conversion cannot be done.
* Added variants of `as_u128`/`from_u128` that truncate unknown bits instead
of panicking.
+* Implemented `Extend<EnumSet<T>>` and `FromIterator<EnumSet<T>>` for
+ `EnumSet<T>`.
## Bugfixes
* Fixed a bug where the procedural macro would fail on enums with a repr