fix: prevent crash when BigInt passed to res.status()

lib/response.js

@@ -64,11 +64,11 @@ module.exports = res
 res.status = function status(code) {
   // Check if the status code is not an integer
   if (!Number.isInteger(code)) {
-    throw new TypeError(`Invalid status code: ${JSON.stringify(code)}. Status code must be an integer.`);
+    throw new TypeError(`Invalid status code: ${String(code)} (${typeof code}). Status code must be an integer.`);
   }
   // Check if the status code is outside of Node's valid range
   if (code < 100 || code > 999) {
-    throw new RangeError(`Invalid status code: ${JSON.stringify(code)}. Status code must be greater than 99 and less than 1000.`);
+    throw new RangeError(`Invalid status code: ${String(code)} (${typeof code}). Status code must be greater than 99 and less than 1000.`);
   }
 
   this.statusCode = code;

test/res.sendStatus.js

@@ -40,5 +40,41 @@ describe('res', function () {
         .get('/')
         .expect(500, /TypeError: Invalid status code/, done)
     })
+
+    it('should raise error for BigInt status code', function (done) {
+      var app = express()
+
+      app.use(function (req, res) {
+        res.sendStatus(200n)
+      })
+
+      request(app)
+        .get('/')
+        .expect(500, /TypeError: Invalid status code: 200 \(bigint\)/, done)
+    })
+
+    it('should raise error for string status code', function (done) {
+      var app = express()
+
+      app.use(function (req, res) {
+        res.sendStatus('200')
+      })
+
+      request(app)
+        .get('/')
+        .expect(500, /TypeError: Invalid status code: 200 \(string\)/, done)
+    })
+
+    it('should raise error for object status code', function (done) {
+      var app = express()
+
+      app.use(function (req, res) {
+        res.sendStatus({ status: 200 })
+      })
+
+      request(app)
+        .get('/')
+        .expect(500, /TypeError: Invalid status code.*\(object\)/, done)
+    })
   })
 })

test/res.status.js

@@ -200,6 +200,18 @@ describe('res', function () {
           .get('/')
           .expect(500, /Invalid status code/, done);
       });
+
+      it('should raise error for BigInt status code', function (done) {
+        var app = express();
+
+        app.use(function (req, res) {
+          res.status(200n).end();
+        });
+
+        request(app)
+          .get('/')
+          .expect(500, /TypeError: Invalid status code: 200 \(bigint\)/, done);
+      });
     });
   });
 });