i used it for pact, as it was easier and less roundabout to query with "what xforms are related to this case"

it proved to be problematic for the bihar cases on case_details because of multi-cases, so i ultimately implemented that with "get all xforms in this set of ids (extracted from case.xform_ids) then put filters in them that way. a roundabout way of doing the same thing.

hsph and CRS are the other two reports that relied upon FullCases in a similar way, so i'd prefer if we'd had a reliable way of interrogating the xforms by a case_id alone.