Plugin API event off does not work properly

[airslice]

Describe the bug

Calling reearth.off from plugin code cannot remove the event listener.

• Calling from console works fine.

To Reproduce
Steps to reproduce the behavior:

1. Create a plugin with call to reearth.on.
2. Check the event fires.
3. Edit plugin code add a call to reearth.off to remove the previous function.
4. The event listener sitll working.

Expected behavior
The event listener should be removed.

Screenshots

Desktop (please complete the following information):

• OS: [macOS]
• Browser [chrome]
• Version [103.0.5060.134]

Smartphone (please complete the following information):

• N/A

Additional context

Some info related:

• The event callbacks are managed in a map with the callback functions as their keys.
• If got the same function it got the same key then can be removed normally.
• When called from plugin context Arena (quickjs-emscripten-sync) somehow wrapped the function as a proxy.
• The proxy now becomes the key and it seems always different (i guess) and make it impossible to remove.