Faster, more compact implementation of std::borrow::Cow
Beef trait has been reworked and now has only two methods: owned_into_parts, which takes the owned value and returns a NonNull fat pointer and capacity, and owned_from_parts which takes a NonNull fat pointer and capacity and reconstructs the owned value.&mut [T] as *mut [T] by constructing the fat pointer from parts internally.no_std support (#5).const_fn feature that makes Cow::borrow a const fn, usable on nightly only (#3).&T to NonNull<T> internally to avoid soundness issues.beef::Cow and std::borrow::Cow can now be converted to one another using the From and Into traits.