public async Task <bool> Append(string key, byte[] value, MemcachedStorageOptions options = null)
 {
     return(await Execute(key, a => a.Append(key, value, options)));
 }
 public async Task Set(string key, byte[] value, MemcachedStorageOptions options = null)
 {
     await Execute(key, a => a.Set(key, value, options));
 }