{"id":"treenode-canonical-definition","text":"`TreeNode` with `val`, `left`, `right` is the canonical binary tree node definition, redefined per-file to match LeetCode's interface rather than shared from a common module.","truth_value":"IN","source":"entries/2026/06/06/leaf-similar-trees-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"treenode-canonical-definition","truth_value":"IN","reason":"premise"}]}}