1 files changed, 13 insertions, 7 deletions
diff --git a/deps/v8/src/builtins/proxy-set-property.tq b/deps/v8/src/builtins/proxy-set-property.tq
index d0411a8e89..2d9636c881 100644
--- a/deps/v8/src/builtins/proxy-set-property.tq
+++ b/deps/v8/src/builtins/proxy-set-property.tq
@@ -19,15 +19,21 @@ namespace proxy {
   // https://tc39.github.io/ecma262/#sec-proxy-object-internal-methods-and-internal-slots-set-p-v-receiver
   transitioning builtin
   ProxySetProperty(implicit context: Context)(
-      proxy: JSProxy, name: Name, value: Object,
-      receiverValue: Object): Object {
+      proxy: JSProxy, name: PropertyKey | PrivateSymbol, value: JSAny,
+      receiverValue: JSAny): JSAny {
     // 1. Assert: IsPropertyKey(P) is true.
     assert(TaggedIsNotSmi(name));
     assert(IsName(name));
 
-    if (IsPrivateSymbol(name)) {
-      CallThrowTypeErrorIfStrict(kProxyPrivate);
-      return Undefined;
+    let key: PropertyKey;
+    typeswitch (name) {
+      case (PrivateSymbol): {
+        CallThrowTypeErrorIfStrict(kProxyPrivate);
+        return Undefined;
+      }
+      case (name: PropertyKey): {
+        key = name;
+      }
     }
 
     try {
@@ -61,8 +67,8 @@ namespace proxy {
       //      exception.
       // 12. Return true.
       const trapResult =
-          Call(context, trap, handler, target, name, value, receiverValue);
-      if (BranchIfToBooleanIsTrue(trapResult)) {
+          Call(context, trap, handler, target, key, value, receiverValue);
+      if (ToBoolean(trapResult)) {
         CheckGetSetTrapResult(target, proxy, name, value, kProxySet);
         return value;
       }