REDCap API doesn't return duplicate ID error in some versions

[nutterb]

We can alleviate this by building in a check for duplicate identifiers and casting an error when it occurs. "Duplicate identifiers" will need to account for record_id and redcap_event_name. Are there other identifiers (that will appear conditionally) that we need to account for?

Nothing comes to mind, but I don't want to code something that can't account for additional identifiers.