class ActiveSupport::Cache::RedisCacheStore

def truncate_key(key)
  if key && key.bytesize > max_key_bytesize
    suffix = ":hash:#{ActiveSupport::Digest.hexdigest(key)}"
    truncate_at = max_key_bytesize - suffix.bytesize
    "#{key.byteslice(0, truncate_at)}#{suffix}"
  else
    key
  end
end