code: function (oldBin, newBin) {
  
      if (!newBin || !newBin.url) {
        // FIXME this is just patching a problem, the source of which I'm not sure
        console.error('spike/index.js#bump-revision - missing newBin', newBin);
        return;
      }
  
      var oldSession = utils.sessionForBin(oldBin),
          oldKey = utils.keyForBin(oldBin),
          newSession = utils.sessionForBin(newBin, true),
          newKey = utils.keyForBin(newBin);
  
      if (!oldSession) { return; }
  
      // Move connections from one session to another
      oldSession.res.forEach(function (res) {
        // Add the connection to the new session's list
        newSession.res.push(res);
        // Upgrade the connection with the new bin
        res.req.bin = newBin;
        // Tell the client to bump their revision
        res.write(utils.makeEvent('bump-revision', newKey));
        if (res.ajax) {
          // lets older browsers finish their xhr request
          res.end();
          res.req.emit('close');
        }
        return false;
      });
  
      // There should be no more connections to this bin, so byebye!
      oldSession.res = [];
      delete sessions[oldKey];
  
    }
docs: Update spikes when a new revision is created.