We create many `useDebugValue` helpers, loggers and so one now, so we can feel less pain.

What matter (**Updated**)
- previewing complex values brifely like chrome devtools does it for arrays, sets, maps, objects,,,

I [wrote related twit](https://twitter.com/mxtnr/status/1178271362890240001) recently with one of my DebugValue helpers. screenshot out here:
<img width="556" alt="Screenshot 2019-09-29 at 14 01 53" src="https://user-images.githubusercontent.com/6201068/66700775-5648bf80-ecfd-11e9-93fe-089d451bcffa.png">
_my named hooks currently require a `label` option unless react babel cannot transform name of variable automatically_
// 
  const cloned = Object.assign([], hooks);
  const queue = [...cloned];
  while (queue.length > 0) {
    const current = queue.pop();
    // 
    delete current.id;
    delete current.isStateEditable;
    if (current.subHooks.length > 0) {
      queue.push(...current.subHooks);
    }
  }
  sanitize(cloned);
  try {
    return JSON.stringify(cloned, null, 2);
  } catch (error) {
    return '';
  }
}
// Keeping this in memory seems to be enough to enable the browser to download larger profiles.
// Without this, we would see a "Download failed: network error" failure.
let downloadUrl = null;
export function downloadFile(