Options are not sent in createStore function so the in memory provider always takes the default ones. https://github.com/ppoliani/koa-idempotency/blob/c54bcc1a3a5f8b31793c1acf1403360d45bd971c/lib/storeProviders/index.js#L20 But the function expects the option argument. https://github.com/ppoliani/koa-idempotency/blob/c54bcc1a3a5f8b31793c1acf1403360d45bd971c/lib/storeProviders/memory.js#L14