v2 RFC

```js
window.localStorage.clear()

function getEntries(obj) {
return Object.entries(obj);
}

const toHashMap = entries => entries.reduce((t, c) => {
return {
...t,
[c[0]]: c[1]
}
}, {});

const hash = obj => encode(JSON.stringify(obj))

const encode = btoa;
const decode = atob;

function storageWatcher(duration = 1000, onChange = () => {}) {
let lastHash = hash(window.localStorage),
id;

const hasChanged = () => hash(window.localStorage) !== lastHash;

const check = () => {
if (hasChanged()) {
const entries = getEntries(window.localStorage);
const hashMap = toHashMap(entries)
lastHash = hash(window.localStorage);
onChange(hashMap)
}
}

return {
start() {
console.log('started')
id = setInterval(check, duration);
},
stop() {
console.log('stopped')
clearInterval(id);
}
}
}

let w = storageWatcher(1000, storage => {
console.log(`local storage changed`, storage)
});

w.start()

window.localStorage.setItem('a', 1);

setTimeout(() => window.localStorage.setItem('b', 2), 500);

setTimeout(() => window.localStorage.setItem('c', 3), 1500);

setTimeout(() => window.localStorage.removeItem('b'), 2500);

setTimeout(() => {
window.localStorage.removeItem('a')
window.localStorage.removeItem('c')

window.localStorage.setItem('c', 3)
window.localStorage.setItem('a', 1);

}, 1500);
```

Start with the JavaScript example in the issue, focusing on the storageWatcher entry point and its start, stop, and change-checking flow. The RFC does not identify project files, tests, or a defined acceptance condition, so clarify the v2 scope and expected behavior before implementation.

Written by the indexing model from the issue text.