Possible memory leak in MemoryCache

[zhibirc]

Each key points to an object with timeout: <timer_id>
Timers are all live even after deleting the actual values for which we created those timers:

MemoryCache.prototype.clear = function() {
  Object.keys(this.cache).forEach(function(key) {
    this.delete(key)
  }, this)

  return true
}

In MemoryCache.prototype.delete we care about this:

if (entry) {
    clearTimeout(entry.timeout)
  }