diamond hunt: godot-0009/0010 + meson-0002 + typeorm-0004/0005 + ts-0003; count 629→635

New diamond recursion defects (O(2^D) → O(N)):
- godot-0009: Font::_is_cyclic no visited set — CJK fallback diamond, 2648x at F=4,D=8
- godot-0010: Font::_update_rids_fb no visited set — duplicate RIDs + O(N^2) hot path
- meson-0002: get_internal_static_libraries_recurse link_whole guard missing — 132x at D=10
- typescript-0003: hasBaseType inner check() no visited set — 1024x at D=10; hot on instanceof

New O(N²) defects:
- typeorm-0004: SubjectTopologicalSorter Array.indexOf dedup — 200x at N=400
- typeorm-0005: DepGraph.createDFS result.indexOf + addDependency edge dedup — 300x at N=600

CLEAN confirmed (diamond recursion sweep): bazel, cargo, cmake, composer, dgl, diesel,
doctrine-orm, efcore, helm, mybatis, networkx-deeper, ninja, npm-arborist, peewee, pip,
rubygems, seaorm, sqlalchemy, swift

UNDF: 571→578 assigned; MOAD count: 629→635

defects/mybatis/patch/mybatis-diamond-recursion-CLEAN.md

@@ -0,0 +1,18 @@
+# mybatis-3 diamond recursion scan — CLEAN
+
+Scanned: 2026-03-29
+Scope: diamond recursion / CWE-407 in ORM dependency graph traversal
+
+## Files checked
+
+- `src/main/java/org/apache/ibatis/session/` — no graph traversal with cycle risk.
+- `src/main/java/org/apache/ibatis/parsing/` — XML parsing, no graph topology.
+- `src/main/java/org/apache/ibatis/executor/resultset/DefaultResultSetHandler.java` —
+  uses `Set`/`Map.containsKey()` for O(1) lookups in result mapping.
+- `src/main/java/org/apache/ibatis/cache/decorators/` — FIFO/LRU cycle is a ring
+  buffer rotation, not a graph cycle detection problem.
+
+## Verdict
+
+CLEAN. MyBatis has no graph dependency ordering code in the migration/schema tool
+category. Result set mapping uses proper Set-based dedup.