diff --git a/packages/thing-contract/package-lock.json b/packages/thing-contract/package-lock.json
new file mode 100644
index 0000000..09fe704
--- /dev/null
+++ b/packages/thing-contract/package-lock.json
@@ -0,0 +1,71 @@
+{
+  "name": "@gamecult/thing-contract",
+  "version": "0.1.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "@gamecult/thing-contract",
+      "version": "0.1.0",
+      "license": "MIT",
+      "dependencies": {
+        "@gamecult/cultcache-ts": "file:../../../CultLib/packages/cultcache-ts"
+      },
+      "devDependencies": {
+        "@types/node": "^24.0.0",
+        "typescript": "^5.9.0"
+      }
+    },
+    "../../../CultLib/packages/cultcache-ts": {
+      "name": "@gamecult/cultcache-ts",
+      "version": "0.14.0",
+      "license": "MIT",
+      "dependencies": {
+        "@msgpack/msgpack": "^3.1.3",
+        "zod": "^3.25.76"
+      },
+      "devDependencies": {
+        "@types/node": "^24.0.0",
+        "typescript": "^5.9.0"
+      },
+      "engines": {
+        "node": ">=20"
+      }
+    },
+    "node_modules/@gamecult/cultcache-ts": {
+      "resolved": "../../../CultLib/packages/cultcache-ts",
+      "link": true
+    },
+    "node_modules/@types/node": {
+      "version": "24.19.2",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-24.19.2.tgz",
+      "integrity": "sha512-93d49wCWJkCyN87MxLpNN6KXPCwFw7bVUg79mGUV1OS40JGWwVCr8n61DXCSqz7CV6/VfPkb7xec7uP2M+QHWQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "undici-types": ">=7.24.0 <7.24.7"
+      }
+    },
+    "node_modules/typescript": {
+      "version": "5.9.3",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.9.3.tgz",
+      "integrity": "sha512-jl1vZzPDinLr9eUt3J/t7V6FgNEw9QjvBPdysz9KfQDD41fQrC2Y4vKQdiaUpFT4bXlb1RHhLpp8wtm6M5TgSw==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "bin": {
+        "tsc": "bin/tsc",
+        "tsserver": "bin/tsserver"
+      },
+      "engines": {
+        "node": ">=14.17"
+      }
+    },
+    "node_modules/undici-types": {
+      "version": "7.24.6",
+      "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-7.24.6.tgz",
+      "integrity": "sha512-WRNW+sJgj5OBN4/0JpHFqtqzhpbnV0GuB+OozA9gCL7a993SmU+1JBZCzLNxYsbMfIeDL+lTsphD5jN5N+n0zg==",
+      "dev": true,
+      "license": "MIT"
+    }
+  }
+}
diff --git a/packages/thing-contract/test/factories.test.ts b/packages/thing-contract/test/factories.test.ts
index 3233c88..bc2cac3 100644
--- a/packages/thing-contract/test/factories.test.ts
+++ b/packages/thing-contract/test/factories.test.ts
@@ -34,7 +34,7 @@ test("each factory builds its outcome", () => {
 });
 
 test("a factory refuses seq below 1 naming Seq, and not the value", () => {
-  for (const bad of [0, -1, -2 ** 31]) {
+  for (const bad of [0, -1, -(2 ** 31)]) {
     for (const build of [
       () => CommandResult.pending(answered, bad, "m"),
       () => CommandResult.completed(answered, bad, null, false, null),