diff --git a/test/internal/builtins-table/same-ids-in-every-build-configuration.test.ts b/test/internal/builtins-table/same-ids-in-every-build-configuration.test.ts
index 80cea7e48059..199555bad701 100644
--- a/test/internal/builtins-table/same-ids-in-every-build-configuration.test.ts
+++ b/test/internal/builtins-table/same-ids-in-every-build-configuration.test.ts
@@ -1,5 +1,5 @@
 import { expect, test } from "bun:test";
-import { bunEnv, bunExe, tempDir } from "harness";
+import { bunEnv, bunExe, isDebug, tempDir } from "harness";
 import { readFileSync } from "node:fs";
 import { basename, join, resolve } from "node:path";
 import { crateOf } from "../../../scripts/build/codegen.ts";
@@ -10,8 +10,9 @@ const bunRoot = resolve(import.meta.dir, "..", "..", "..");
 const schemas = globAllSources().bindgen;
 const testSchemas = schemas.filter(schema => schema.endsWith("_test.bind.ts")).map(schema => basename(schema));
 
-async function idsFor(typesOnly: readonly string[]): Promise<string> {
-  using directory = tempDir("builtins-table", {});
+type Build = "withoutAssertions" | "withAssertions";
+
+async function generateInto(directory: string, typesOnly: readonly string[]) {
   await using generator = Bun.spawn({
     cmd: [
       bunExe(),
@@ -24,19 +25,38 @@ async function idsFor(typesOnly: readonly string[]): Promise<string> {
       `--types-only=${typesOnly.join(",")}`,
     ],
     cwd: bunRoot,
-    env: bunEnv,
+    // The ASAN lane sets BUN_JSC_dumpSimulatedThrows, which nearly doubles a run's time. The exception checks stay on.
+    env: { ...bunEnv, BUN_JSC_dumpSimulatedThrows: undefined },
     stdout: "ignore",
-    stderr: "inherit",
+    stderr: "pipe",
   });
-  expect(await generator.exited).toBe(0);
-  return readFileSync(join(String(directory), "aot_builtin_ids.rs"), "utf8");
+  const [stderr, exitCode] = await Promise.all([generator.stderr.text(), generator.exited]);
+  // Every run prints summaries that begin with "builtins table:". Any other line says what went wrong.
+  const errors = stderr.split("\n").filter(line => line !== "" && !line.startsWith("builtins table:"));
+  return { errors, exitCode, signalCode: generator.signalCode };
 }
 
+// BunAOTHostBindings.cpp names the list of native calls that its build numbers: generate-js2native.ts stamps each list.
+const nativeCallListsOf = (hostBindings: string) => new Set(hostBindings.match(/\bBun__js2nativeList_[0-9a-f]{8}\b/g));
+
 test.skipIf(generated === undefined)(
   "one prebuilt engine serves a build with and a build without assertions",
   async () => {
-    const [withoutAssertions, withAssertions] = await Promise.all([idsFor(testSchemas), idsFor([])]);
-    expect(withAssertions === withoutAssertions).toBe(true);
+    using directory = tempDir("builtins-table", { withoutAssertions: {}, withAssertions: {} });
+    const written = (build: Build, file: string) => readFileSync(join(String(directory), build, file), "utf8");
+    const [withoutAssertions, withAssertions] = await Promise.all([
+      generateInto(join(String(directory), "withoutAssertions"), testSchemas),
+      generateInto(join(String(directory), "withAssertions"), []),
+    ]);
+    const accepted = { errors: [], exitCode: 0, signalCode: null };
+    expect({ withoutAssertions, withAssertions }).toEqual({ withoutAssertions: accepted, withAssertions: accepted });
+
+    // The two are not one build: only with assertions does Bun number the native calls of the *_test.bind.ts schemas.
+    expect(nativeCallListsOf(written("withAssertions", "BunAOTHostBindings.cpp"))).not.toEqual(
+      nativeCallListsOf(written("withoutAssertions", "BunAOTHostBindings.cpp")),
+    );
+    expect(written("withAssertions", "aot_builtin_ids.rs")).toBe(written("withoutAssertions", "aot_builtin_ids.rs"));
   },
-  120_000,
+  // With a debug build the two runs take 7 to 8 minutes together.
+  isDebug ? 900_000 : 120_000,
 );