diff --git a/src/builtins/builtins-array.cc b/src/builtins/builtins-array.cc
index ea45a7ada6b..4ed66c8113f 100644
--- a/src/builtins/builtins-array.cc
+++ b/src/builtins/builtins-array.cc
@@ -407,6 +407,46 @@ BUILTIN(ArrayPush) {
   return *isolate->factory()->NewNumberFromUint((new_length));
 }
 
+BUILTIN(ArrayOffByOne) {
+	HandleScope scope(isolate);
+	Factory *factory = isolate->factory();
+	Handle<Object> receiver = args.receiver();
+
+	if (!IsJSArray(*receiver) || !HasOnlySimpleReceiverElements(isolate, Cast<JSArray>(*receiver))) {
+	  THROW_NEW_ERROR_RETURN_FAILURE(isolate, NewTypeError(MessageTemplate::kPlaceholderOnly,
+    	factory->NewStringFromAsciiChecked("Nope")));
+	}
+
+	Handle<JSArray> array = Cast<JSArray>(receiver);
+
+	ElementsKind kind = array->GetElementsKind();
+
+	if (kind != PACKED_DOUBLE_ELEMENTS) {
+	  THROW_NEW_ERROR_RETURN_FAILURE(isolate, NewTypeError(MessageTemplate::kPlaceholderOnly,
+    	factory->NewStringFromAsciiChecked("Need an array of double numbers")));
+	}
+
+	if (args.length() > 2) {
+	  THROW_NEW_ERROR_RETURN_FAILURE(isolate, NewTypeError(MessageTemplate::kPlaceholderOnly,
+    	factory->NewStringFromAsciiChecked("Too many arguments")));
+	}
+	
+	Handle<FixedDoubleArray> elements(Cast<FixedDoubleArray>(array->elements()), isolate);
+	uint32_t len = static_cast<uint32_t>(Object::NumberValue(array->length()));
+	if (args.length() == 1) {	// read mode
+		return *(isolate->factory()->NewNumber(elements->get_scalar(len)));
+	} else {	// write mode
+		Handle<Object> value = args.at(1);
+		if (!IsNumber(*value)) {
+		  THROW_NEW_ERROR_RETURN_FAILURE(isolate, NewTypeError(MessageTemplate::kPlaceholderOnly,
+    		factory->NewStringFromAsciiChecked("Need a number argument")));
+		}
+		double num = static_cast<double>(Object::NumberValue(*value));
+		elements->set(len, num);
+		return ReadOnlyRoots(isolate).undefined_value();
+	}
+}
+
 namespace {
 
 V8_WARN_UNUSED_RESULT Tagged<Object> GenericArrayPop(Isolate* isolate,
diff --git a/src/builtins/builtins-definitions.h b/src/builtins/builtins-definitions.h
index 78cbf8874ed..8a0bd959a29 100644
--- a/src/builtins/builtins-definitions.h
+++ b/src/builtins/builtins-definitions.h
@@ -394,6 +394,7 @@ namespace internal {
       ArraySingleArgumentConstructor)                                          \
   TFC(ArrayNArgumentsConstructor, ArrayNArgumentsConstructor)                  \
   CPP(ArrayConcat)                                                             \
+  CPP(ArrayOffByOne)                                                           \
   /* ES6 #sec-array.prototype.fill */                                          \
   CPP(ArrayPrototypeFill)                                                      \
   /* ES7 #sec-array.prototype.includes */                                      \
diff --git a/src/compiler/typer.cc b/src/compiler/typer.cc
index 9a346d134b9..ce31f92b876 100644
--- a/src/compiler/typer.cc
+++ b/src/compiler/typer.cc
@@ -1937,6 +1937,8 @@ Type Typer::Visitor::JSCallTyper(Type fun, Typer* t) {
       return Type::Receiver();
     case Builtin::kArrayUnshift:
       return t->cache_->kPositiveSafeInteger;
+	case Builtin::kArrayOffByOne:
+	  return Type::Receiver();
 
     // ArrayBuffer functions.
     case Builtin::kArrayBufferIsView:
diff --git a/src/d8/d8.cc b/src/d8/d8.cc
index facf0d86d79..382c015bc48 100644
--- a/src/d8/d8.cc
+++ b/src/d8/d8.cc
@@ -3364,7 +3364,7 @@ Local<FunctionTemplate> Shell::CreateNodeTemplates(
 
 Local<ObjectTemplate> Shell::CreateGlobalTemplate(Isolate* isolate) {
   Local<ObjectTemplate> global_template = ObjectTemplate::New(isolate);
-  global_template->Set(Symbol::GetToStringTag(isolate),
+/*  global_template->Set(Symbol::GetToStringTag(isolate),
                        String::NewFromUtf8Literal(isolate, "global"));
   global_template->Set(isolate, "version",
                        FunctionTemplate::New(isolate, Version));
@@ -3385,13 +3385,13 @@ Local<ObjectTemplate> Shell::CreateGlobalTemplate(Isolate* isolate) {
   global_template->Set(isolate, "readline",
                        FunctionTemplate::New(isolate, ReadLine));
   global_template->Set(isolate, "load",
-                       FunctionTemplate::New(isolate, ExecuteFile));
+                       FunctionTemplate::New(isolate, ExecuteFile));*/
   global_template->Set(isolate, "setTimeout",
                        FunctionTemplate::New(isolate, SetTimeout));
   // Some Emscripten-generated code tries to call 'quit', which in turn would
   // call C's exit(). This would lead to memory leaks, because there is no way
   // we can terminate cleanly then, so we need a way to hide 'quit'.
-  if (!options.omit_quit) {
+/*  if (!options.omit_quit) {
     global_template->Set(isolate, "quit", FunctionTemplate::New(isolate, Quit));
   }
   global_template->Set(isolate, "testRunner",
@@ -3410,7 +3410,7 @@ Local<ObjectTemplate> Shell::CreateGlobalTemplate(Isolate* isolate) {
   if (i::v8_flags.expose_async_hooks) {
     global_template->Set(isolate, "async_hooks",
                          Shell::CreateAsyncHookTemplate(isolate));
-  }
+  }*/
 
   return global_template;
 }
diff --git a/src/init/bootstrapper.cc b/src/init/bootstrapper.cc
index 48249695b7b..99dc014c13c 100644
--- a/src/init/bootstrapper.cc
+++ b/src/init/bootstrapper.cc
@@ -2533,6 +2533,8 @@ void Genesis::InitializeGlobal(Handle<JSGlobalObject> global_object,
 
     SimpleInstallFunction(isolate_, proto, "at", Builtin::kArrayPrototypeAt, 1,
                           true);
+    SimpleInstallFunction(isolate_, proto, "offByOne",
+                          Builtin::kArrayOffByOne, 1, false);
     SimpleInstallFunction(isolate_, proto, "concat",
                           Builtin::kArrayPrototypeConcat, 1, false);
     SimpleInstallFunction(isolate_, proto, "copyWithin",