Refactoring

Support Laravel 9

Support self-relation aggregate queries with column

Refactor and document recursive query constraints

Improve depthFirst() with integer keys

Co-authored-by: Amir Rami <[email protected]>

Select depth in descendants query of *OfDescendants relations

Add MorphedByManyOfDescendants relation

Refactoring

Add Bloodline relation

Fix recursion issues with JSON encoding of toTree() results