How to releaseProxy from the expose() side?

[HuakunShen]

I am exposing JS object to iframe from the main thread.
When I navigate between pages, the object gets exposed to iframe window multiple times, and got repeated requests.
If I enter the page with iframe 3 times, a request from iframe will trigger 3 times.

After some experiment I found that if I releaseProxy from within iframe, the problem is gone.
But I don't have full control over the content in iframe, thus need to find a way to release proxy from the expose() side (main thread)