Function up

packages/sync-core/src/test/upgradeDowngrade.test.ts:89–94

({ age: _age, ...user }: any)

		{
			id: UserVersions.ReplaceAgeWithBirthdate,
			up({ age: _age, ...user }: any) {
				return {
					...user,
					birthdate: null,
				}
			},
			down({ birthdate: _birthdate, ...user }: any) {
				return {
					...user,