Vue switched to proxies in v3. They haven’t had great browser support for a very long time, and if I remember correctly, polyfilling them was difficult.
Yeah Vue 2 used object getters and setters, and there were a few tricky caveats. For example, setting an array item using an index wouldn't trigger the setters (e.g. `myArray[0] = ''`). You had to remember these edge cases and use `Vue.set` [1]. Proxies made everything so much simpler, but they can't really be polyfilled at all, because they require deep JS engine integration (e.g. to register a callback that gets notified whenever a property is added to an object).
Yeah, the Vue-like I made (other comment) was my second attempt at it and this time using just Proxy to simplify things. The first time I had tried to do it as Vue did previously with defineProperty but it was a damn mess to try to support arrays,etc and honestly the code was never stable (and using Vue V2 you can also run into a few edge-cases like missing properties missing reactivity).
