{"id":"evaltree-leaf-detection-left-only","text":"`evalTree` detects leaf nodes by checking only `root.left is None`, never checking `root.right` — this is correct only under the full binary tree invariant where every non-leaf has exactly two children.","truth_value":"IN","source":"entries/2026/06/06/evaluate-boolean-binary-tree-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"evaltree-leaf-detection-left-only","truth_value":"IN","reason":"premise"}]}}