So siehts ganz gut aus !

node_modules/core-js/modules/_own-keys.js

@@ -0,0 +1,10 @@
+// all object keys, includes non-enumerable and symbols
+var gOPN = require('./_object-gopn');
+var gOPS = require('./_object-gops');
+var anObject = require('./_an-object');
+var Reflect = require('./_global').Reflect;
+module.exports = Reflect && Reflect.ownKeys || function ownKeys(it) {
+  var keys = gOPN.f(anObject(it));
+  var getSymbols = gOPS.f;
+  return getSymbols ? keys.concat(getSymbols(it)) : keys;
+};