`Symbol.toStringTag` on `MessageChannel` and `MessagePort`

Version

v26.7.0

Platform

Darwin MacBook-Air-3.local 25.5.0 Darwin Kernel Version 25.5.0: Tue Jun  9 22:26:46 PDT 2026; root:xnu-12377.121.10~1/RELEASE_ARM64_T8103 arm64

Subsystem

No response

What steps will reproduce the bug?

node -e "console.log(Object.prototype.toString.call(new MessageChannel()))"

node -e "console.log(Object.prototype.toString.call(new MessageChannel().port1))"

How often does it reproduce? Is there a required condition?

Always. No special required condition.

What is the expected behavior? Why is that the expected behavior?

Display [object MessageChannel] and [object MessagePort] respectively.

What do you see instead?

[object Object]

[object EventTarget]

Additional information

No response

まず、issue にある 2 つの node -e 再現コマンドを実行し、それらのオブジェクトタグを決定する MessageChannel と MessagePort のランタイムエントリポイントを追跡します。呼び出しが [object MessageChannel] と [object MessagePort] を生成し、両方のケースに対するリグレッションカバレッジが追加されていれば完了です。