Allow for creating Private API symbols that have a number as an ID

test/cctest/test-api.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 25008 matching lines @@
 
   v8::Local<v8::Value> is_frozen = CompileRun("Object.isFrozen(o)");
   CHECK(!is_frozen->BooleanValue(context.local()).FromJust());
 
   CHECK(obj->SetIntegrityLevel(context.local(), v8::IntegrityLevel::kFrozen)
             .FromJust());
 
   is_frozen = CompileRun("Object.isFrozen(o)");
   CHECK(is_frozen->BooleanValue(context.local()).FromJust());
 }
+
+TEST(PrivateForApiIsNumber) {
+  LocalContext context;
+  v8::Isolate* isolate = CcTest::isolate();
+  v8::HandleScope scope(isolate);
+
+  // Shouldn't crash.
+  v8::Private::ForApi(isolate, v8_str("42"));
+}