[_nalply]

Private properties don't work with Proxy.

https://lea.verou.me/blog/2023/04/private-fields-considered-...

Quote:

> Private fields, proxies, pick one, you can’t have both.

[moritzwarhier]

For the same reason, they are forbidden in MobX. Hello underscore!

And thank god for TypeScript compiler's private keyword! While... I can see how this plethora of possibilities looks confusing.