Proxy based patch generation

[Korijn]

As an alternative to diffing, one can also monitor mutations as they are being made against the input and emit patches, by using a proxy mechanism. This is how Immer works. It's much more efficient than diffing, of course.

[berendkleinhaneveld]

Yeah, I wanted to propose to do something like this within observ actually as we have all the proxy stuff in place.

[Korijn]

I thought about doing that, but I think it requires very different trap implementations and assignments, so we might as well implement it here in this library and keep observ focused on what it does best.

[Korijn]

The magic is here: https://github.com/immerjs/immer/blob/master/src/core/proxy.ts