fix(python): honor version-specific code equality

Fixes #6547

src/python/PythonPycParser.test.ts

@@ -918,6 +918,68 @@ it("accepts code objects as set members and dictionary keys", () => {
   expect(pythonPycSchema.safeParse(report).success).toBe(true);
 });
 
+it("uses the code equality fields for each CPython layout", () => {
+  const codeCollections = (
+    layout: "py38" | "py311",
+    different: boolean,
+  ): [Buffer, Buffer] => {
+    const lineA = marshalCode(layout, {
+      name: "f",
+      filename: "fixture.py",
+      firstlineno: 1,
+      linetable: Buffer.from([2, 1]),
+    });
+    const lineB = marshalCode(layout, {
+      name: "f",
+      filename: "fixture.py",
+      firstlineno: 1,
+      linetable: Buffer.from([2, different ? 2 : 1]),
+    });
+    const frozenSet = Buffer.concat([
+      Buffer.from([0x3e]),
+      u32(2),
+      lineA,
+      lineB,
+    ]);
+    const dict = Buffer.concat([
+      Buffer.from([0x7b]),
+      lineA,
+      Buffer.from([0x4e]),
+      lineB,
+      Buffer.from([0x54, 0x30]),
+    ]);
+    return [frozenSet, dict];
+  };
+  for (const [magic, layout] of [
+    [3413, "py38"],
+    [3439, "py38"],
+  ] as const) {
+    const [frozenSet, dict] = codeCollections(layout, true);
+    const report = parse(
+      Buffer.concat([
+        pythonPycHeader(magic),
+        marshalCode(layout, { consts: [frozenSet, dict] }),
+      ]),
+    );
+    expect(root(report).consts).toEqual([
+      { kind: "frozenset", length: 1 },
+      { kind: "dict", length: 1 },
+    ]);
+  }
+
+  const [frozenSet, dict] = codeCollections("py311", true);
+  const py312 = parse(
+    Buffer.concat([
+      pythonPycHeader(3531),
+      marshalCode("py311", { consts: [frozenSet, dict] }),
+    ]),
+  );
+  expect(root(py312).consts).toEqual([
+    { kind: "frozenset", length: 2 },
+    { kind: "dict", length: 2 },
+  ]);
+});
+
 it("keeps the first dictionary key when a later key compares equal", () => {
   const key = (filename: string): Buffer =>
     marshalCode("py311", {

src/python/PythonPycParser.ts

@@ -1156,8 +1156,12 @@ class MarshalReader {
       `${node.bytecode.bytes}:${node.bytecode.sha256}`,
       this.#constKeyItems(material.consts),
       ...nameTables,
-      material.linetable,
-      material.exceptiontable,
+      // CPython started including line and exception tables in code equality
+      // with the 3.11 code layout; earlier layouts still retain their digests
+      // in CodeEquality, but those fields do not affect container identity.
+      ...(this.layout === "py311"
+        ? [material.linetable, material.exceptiontable]
+        : []),
     ];
     const key = this.#boundedJoin(
       "",