truncate_key

# File activesupport/lib/active_support/cache/redis_cache_store.rb, line 445
        def truncate_key(key)
          if key && key.bytesize > max_key_bytesize
            suffix = ":sha2:#{::Digest::SHA2.hexdigest(key)}"
            truncate_at = max_key_bytesize - suffix.bytesize
            "#{key.byteslice(0, truncate_at)}#{suffix}"
          else
            key
          end
        end