{"id":"btree-delete-three-valued-return","text":"`_delete` returns `False` (not found), `True` (deleted, no cleanup needed), or the string `'empty'` (leaf now empty, parent should attempt cleanup); the public `delete()` collapses this to `bool`","truth_value":"IN","source":"entries/2026/05/28/b-tree-storage-engine-btree-_delete.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"explanation":{"steps":[{"node":"btree-delete-three-valued-return","truth_value":"IN","reason":"premise"}]}}