mysqljs
diff --git a/‎Changes.md
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diff --git a/‎lib/Connection.js
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+5-7Lines changed: 5 additions & 7 deletions b/‎lib/Connection.js
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+5-7Lines changed: 5 additions & 7 deletions
diff --git a/‎test/unit/query/test-args-query-like-object-values.js
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diff --git a/‎test/unit/query/test-args-query-like-object.js
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@@ -12,6 +12,7 @@ you spot any mistakes.
 * Fix early detection of bad callback to `connection.query`
 * Support Node.js 12.x #2211
 * Support Node.js 13.x
+* Support non-enumerable properties in object argument to `connection.query` #2253
 * Update `bignumber.js` to 9.0.0
 * Update `readable-stream` to 2.3.7
 
 
@@ -33,22 +33,20 @@ Connection.createQuery = function createQuery(sql, values, callback) {
   if (typeof sql === 'function') {
     cb = sql;
   } else if (typeof sql === 'object') {
-    for (var prop in sql) {
-      options[prop] = sql[prop];
-    }
+    options = Object.create(sql);
 
     if (typeof values === 'function') {
       cb = values;
     } else if (values !== undefined) {
-      options.values = values;
+      Object.defineProperty(options, 'values', { value: values });
     }
   } else {
-    options.sql    = sql;
-    options.values = values;
+    options.sql = sql;
 
     if (typeof values === 'function') {
       cb = values;
-      options.values = undefined;
+    } else if (values !== undefined) {
+      options.values = values;
     }
   }
 
 
@@ -0,0 +1,29 @@
+var assert     = require('assert');
+var common     = require('../../common');
+var connection = common.createConnection({port: common.fakeServerPort});
+
+var server = common.createFakeServer();
+var sqlQuery = Object.create(null, {
+  sql: {
+    enumerable : false,
+    value      : 'SELECT ?',
+    writable   : false
+  },
+  values: {
+    enumerable : false,
+    value      : [42],
+    writable   : false
+  }
+});
+
+server.listen(common.fakeServerPort, function (err) {
+  assert.ifError(err);
+
+  connection.query(sqlQuery, [99], function (err, rows) {
+    assert.ifError(err);
+    assert.strictEqual(rows.length, 1);
+    assert.strictEqual(rows[0]['99'], 99);
+    connection.destroy();
+    server.destroy();
+  });
+});
@@ -0,0 +1,29 @@
+var assert     = require('assert');
+var common     = require('../../common');
+var connection = common.createConnection({port: common.fakeServerPort});
+
+var server = common.createFakeServer();
+var sqlQuery = Object.create(null, {
+  sql: {
+    enumerable : false,
+    value      : 'SELECT ?',
+    writable   : false
+  },
+  values: {
+    enumerable : false,
+    value      : [42],
+    writable   : false
+  }
+});
+
+server.listen(common.fakeServerPort, function (err) {
+  assert.ifError(err);
+
+  connection.query(sqlQuery, function (err, rows) {
+    assert.ifError(err);
+    assert.strictEqual(rows.length, 1);
+    assert.strictEqual(rows[0]['42'], 42);
+    connection.destroy();
+    server.destroy();
+  });
+});