[known issue]: using ref() on certain objects fails

[brombal]

Currently ref() marks an object as a reference by adding a symbol property to it, but this fails for objects are not extensible. The workaround is to wrap the desired ref object in another plain object, like this:

myState.someRef = ref({ value: nonExtensibleObject });

But this is not ideal. Keck should probably just use a WeakSet to store ref objects instead of a symbol property.