Casts an archived value from the given byte slice by calculating the root position.
This is a wrapper for
archived_value that calculates the correct
position of the root using the length of the byte slice. If your byte slice is not guaranteed to
end immediately after the root object, you may need to store the position of the root object
- The byte slice must represent an archived object
- The root of the object must be stored at the end of the slice (this is the default behavior)