Proxies can cause async race conditions

[ethanchristensen01]

After migrating to Vue 3, this was causing major bugs for several weeks. Today I figured out they were caused by Vue 3 Proxies being exposed to external code that doesn't expect a changing object.

Someone else wrote about their problems with the same issue:
https://www.hendrik-erz.de/post/death-by-proxy

Can the breaking changes page be updated to talk about this?