docs: function mimeFormatLookup (mime) {
          var charset = require('charset')(mime);
  
          // sanitise the mime argument
          mime = String(mime).toLowerCase().replace(/\s/g, E).replace(/^([^;]+).*$/g, '$1');
          var result = db[mime] || module.exports.guess(mime);
  
          // add the charset info to the mime.
          result && charset && (result.charset = charset);
          result && (result.source = mime); // store the sanitised mime
          return result;
      }