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

test/cctest/test-api.cc

Index: test/cctest/test-api.cc
diff --git a/test/cctest/test-api.cc b/test/cctest/test-api.cc
index 3d7bddda79679c8f3d5516cc5c56832475050f3a..86dcb9e9546d976e0f1f6efed54bbe4a5dc7edd7 100644
--- a/test/cctest/test-api.cc
+++ b/test/cctest/test-api.cc
@@ -25026,3 +25026,12 @@ TEST(SetIntegrityLevel) {
   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"));
+}