Hey team,
When using the HTTP API to publish an event with user properties included, will the existing user property array for the user get added to or updated entirely?
For example, if user Alice had a user property called `cohorts`, and I published a `join_cohort` event with `{ cohorts: [new_cohort_name] }` in user properties, will that outright set her `cohorts` value to just the new cohort or will it instead append the new cohort name to the existing list of cohorts? Thanks!