Proposal: @wry/equality and handling react / preact specific code

[ScottAwesome]

I have a relatively simple proposal, which is handling of equality comparisions for react / preact elements.

I think, more or less, it would look like the code below, (though I would need to do some detection mechanism to figure out if its a react / preact object or not)

if (hasElementType && a instanceof Element) {
  return false;
}

// this would be the react object
const keys = Object.keys(a);
const length = keys.length;
// custom handling for React/Preact
for (let i = length; i-- !== 0; ) {
  if ((keys[i] === '_owner' || keys[i] === '__v' || keys[i] === '__o') && a.$$typeof) {
    // React-specific: avoid traversing React elements' _owner
    // Preact-specific: avoid traversing Preact elements' __v and __o
    //    __v = $_original / $_vnode
    //    __o = $_owner
    // These properties contain circular references and are not needed when
    // comparing the actual elements (and not their owners)
    // .$$typeof and ._store on just reasonable markers of elements

    continue;
  }

  // all other properties should be traversed as usual
  if (!equal(a[keys[i]], b[keys[i]])) {
    return false;
  }
}

This would make it safe to use for equality with APIs like React.memo and prop comparisions