## Added
- Functions for casting from core references (#181)
  - `Array::cast_from_core`: `const fn` equivalent of `From<[T; N]>`
  - `Array::cast_from_core_mut`: `mut` equivalent of the above
  - `Array::from_ref`: cast `&T` to `&Array<T; U1>`
  - `Array::from_mut`: `mut` equivalent of the above