{"id":"tree-to-list-strips-trailing-nulls","text":"`tree_to_list` removes all trailing `None` entries from its BFS level-order output, matching LeetCode's canonical serialization format.","truth_value":"IN","source":"entries/2026/06/06/merge-two-binary-trees-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"tree-to-list-strips-trailing-nulls","truth_value":"IN","reason":"premise"}]}}