Detto: Simulate data structure by Proxy feature

Detto has following features:

- Not just a deep clone, you could wrap anything in any paticular nested object. - You could watch change.

See usage: https://github.com/iendeavor/detto#usage

Real world example: https://github.com/iendeavor/form-validation.js

With detto (AKA [ditto](https://bulbapedia.bulbagarden.net/wiki/Ditto_(Pok%C3%A9mon)...), you can simulate (clone) data structure, store any values into it, and watch it.