Instead of using static futures when processing a query in parallel, we now use a new executor model, which allows us to process futures which make use of references. As a result, we can remove the need to store each statement in an Arc.
Instead of creating a new Vec<_> for every embedded path part, we now use a reference when calling get/set/del on a value’s data. This means we aren’t creating and copying the Vec items each and every time we traverse down a path.
