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_
if (!isLetter(char)) {
      
      return char;
    }
    return '[' + char.toLowerCase() + char.toUpperCase() + ']';
  }
  
  
  const escaped = escapeStringRegExp(string);
  const firstChar = escaped[0];
  let restRegex = '';
  
  
  for (let i = 1; i < escaped.length; i++) {
    restRegex += matchAnyCase(escaped[i]);
  }
  if (!isLetter(firstChar)) {
    
    
    return new RegExp(firstChar + restRegex);
  }
  
  return new RegExp(