code: func (r *Cache) EvictAll() {
  	r.mu.RLock()
  	defer r.mu.RUnlock()
  	if r.closed {
  		return
  	}
  
  	if r.cacher != nil {
  		r.cacher.EvictAll()
  	}
  }
docs: // EvictAll evicts all 'cache node'. This will simply call Cacher.EvictAll.