Suggestion: Support deque-like operations?

[paulo-raca]

Hello, and thanks for this great library.

Given it is implemented as a circular buffer, it would be (reasonably) easy to support deque-like operations. E.g.: addFront/addBack, peekFront/peekBack, removeFront/removeBack, iterator/descendingIterator`

From what I can tell, doing it would require changes to the file format.
E.g., we can add the length of each element twice, both before and after the payload, so that the list can be traversed on both directions.