fixup! fixup! repl: refactor to avoid unsafe array iteration

Author: RaisinTen

lib/internal/util/inspect.js

@@ -309,16 +309,17 @@ function inspect(value, opts) {
     if (typeof opts === 'boolean') {
       ctx.showHidden = opts;
     } else if (opts) {
-      const optKeys = ObjectKeys(opts);
-      for (const key of optKeys) {
+      for (const key in opts) {
         // TODO(BridgeAR): Find a solution what to do about stylize. Either make
         // this function public or add a new API with a similar or better
         // functionality.
         if (
           ObjectPrototypeHasOwnProperty(inspectDefaultOptions, key) ||
           key === 'stylize') {
           ctx[key] = opts[key];
-        } else if (ctx.userOptions === undefined) {
+        } else if (
+          ObjectPrototypeHasOwnProperty(opts, key) &&
+          ctx.userOptions === undefined) {
           // This is required to pass through the actual user input.
           ctx.userOptions = opts;
         }