Better arity checks for overloads

Source/bindings/v8/custom/V8ElementCustom.cpp

Index: Source/bindings/v8/custom/V8ElementCustom.cpp
diff --git a/Source/bindings/v8/custom/V8ElementCustom.cpp b/Source/bindings/v8/custom/V8ElementCustom.cpp
index 0aad602df30789e305f9ee4523acf6e7d58456d2..c056c7b2f85a944e457b683cebcf9ee5a8b6abc9 100644
--- a/Source/bindings/v8/custom/V8ElementCustom.cpp
+++ b/Source/bindings/v8/custom/V8ElementCustom.cpp
@@ -164,6 +164,7 @@ void animate6Method(const v8::FunctionCallbackInfo<v8::Value>& info)
 void V8Element::animateMethodCustom(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     v8::Isolate* isolate = info.GetIsolate();
+    ExceptionState exceptionState(ExceptionState::ExecutionContext, "animate", "Element", info.Holder(), isolate);
     // AnimationPlayer animate(
     //     (AnimationEffect or sequence<Dictionary>)? effect,
     //     optional (double or Dictionary) timing);
@@ -229,11 +230,10 @@ void V8Element::animateMethodCustom(const v8::FunctionCallbackInfo<v8::Value>& i
             return;
         }
         break;
-    }
-    ExceptionState exceptionState(ExceptionState::ExecutionContext, "animate", "Element", info.Holder(), isolate);
-    if (UNLIKELY(info.Length() < 1)) {
-        throwArityTypeError(exceptionState, 1, info.Length());
+    default:
+        throwArityTypeError(exceptionState, "[1]", info.Length());
         return;
+        break;
     }
     exceptionState.throwTypeError("No function was found that matched the signature provided.");
     exceptionState.throwIfNeeded();