When we have multiple iframes with the same origin, we can share objects between different iframe window. But immer produce has a check isPlainObject(), there is a condition "Object.getPrototype(xxx) === Object.prototype", which makes this scenario broken. Because the window.Object.prototype in different iframes have different instances. This condition will return false.

The basic repro example is:

in iframe, we can set window.parent.test = {a: 1} (this can work when iframe and parent have same origin)
in parent window, we can access window.test and produce(window.test, (draft) => { } ), but this action will get exception "Not a plain object"

Can we change the condition "Object.getPrototype(xxx) === Object.prototype" in the function isPlainObject() ?