Bump to v4.17.12.

_safeGet.js

@@ -1,5 +1,5 @@
 /**
- * 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.
@@ -7,6 +7,10 @@
  * @returns {*} Returns the property value.
  */
 function safeGet(object, key) {
+  if (key === 'constructor' && typeof object[key] === 'function') {
+    return;
+  }
+
   if (key == '__proto__') {
     return;
   }