fix(sendStatus): prevent BigInt status codes

lib/response.js

@@ -326,6 +326,18 @@ res.jsonp = function jsonp(obj) {
  */
 
 res.sendStatus = function sendStatus(statusCode) {
+  // Prevent BigInt status codes from causing obscure errors
+  if (typeof statusCode === 'bigint') {
+    throw new TypeError('Status code must be an integer number');
+  }
+  if (typeof statusCode !== 'number' || !Number.isInteger(statusCode) || statusCode < 100 || statusCode > 999) {
+    if (!Number.isInteger(statusCode)) {
+      throw new TypeError(`Invalid status code: ${JSON.stringify(statusCode)}. Status code must be an integer.`);
+    } else {
+      throw new RangeError(`Invalid status code: ${JSON.stringify(statusCode)}. Must be between 100 and 999.`);
+    }
+  }
+
   var body = statuses.message[statusCode] || String(statusCode)
 
   this.status(statusCode);

test/res.sendStatus.js

@@ -40,5 +40,18 @@ describe('res', function () {
         .get('/')
         .expect(500, /TypeError: Invalid status code/, done)
     })
+
+    it('should raise error for BigInt(200) status code', function (done) {
+      var app = express();
+
+      app.use(function (req, res) {
+        res.sendStatus(BigInt(200));
+      });
+
+      request(app)
+        .get('/')
+        .expect(500)
+        .expect(/Status code must be an integer/, done);
+    });
   })
 })