Ignore numbers as values of --expose-natives-as flag.

src/bootstrapper.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/bootstrapper.h"
 
 #include "src/accessors.h"
 #include "src/code-stubs.h"
 #include "src/extensions/externalize-string-extension.h"
 #include "src/extensions/free-buffer-extension.h"
@@ skipping 2195 matching lines @@
       Object::GetProperty(isolate, global, "Error").ToHandleChecked());
   Handle<String> name =
       factory->InternalizeOneByteString(STATIC_ASCII_VECTOR("stackTraceLimit"));
   Handle<Smi> stack_trace_limit(Smi::FromInt(FLAG_stack_trace_limit), isolate);
   JSObject::AddProperty(Error, name, stack_trace_limit, NONE);
 
   // Expose the natives in global if a name for it is specified.
   if (FLAG_expose_natives_as != NULL && strlen(FLAG_expose_natives_as) != 0) {
     Handle<String> natives =
         factory->InternalizeUtf8String(FLAG_expose_natives_as);
+    uint32_t dummy_index;
+    if (natives->AsArrayIndex(&dummy_index)) return true;
     JSObject::AddProperty(global, natives, handle(global->builtins()),
                           DONT_ENUM);
   }
 
   // Expose the stack trace symbol to native JS.
   RETURN_ON_EXCEPTION_VALUE(
       isolate,
       JSObject::SetOwnPropertyIgnoreAttributes(
           handle(native_context->builtins(), isolate),
           factory->InternalizeOneByteString(
@@ skipping 500 matching lines @@
   return from + sizeof(NestingCounterType);
 }
 
 
 // Called when the top-level V8 mutex is destroyed.
 void Bootstrapper::FreeThreadResources() {
   DCHECK(!IsActive());
 }
 
 } }  // namespace v8::internal