Bump to v4.17.12.

_safeGet.js

@@ -1,7 +1,7 @@
 define([], function() {
 
   /**
-   * Gets the value at `key`, unless `key` is "__proto__".
+   * Gets the value at `key`, unless `key` is "__proto__" or "constructor".
    *
    * @private
    * @param {Object} object The object to query.
@@ -9,6 +9,10 @@ define([], function() {
    * @returns {*} Returns the property value.
    */
   function safeGet(object, key) {
+    if (key === 'constructor' && typeof object[key] === 'function') {
+      return;
+    }
+
     if (key == '__proto__') {
       return;
     }