Finally we have some auto-generated documentation for the page /conduit/method/transaction.search/ about the supported values of objectType.
This is useful since we have 70+ of them, and they are totally obscure to newcomers (and us, core team, lol).
The already-existing exception messages now do not suggest anymore values that exist but are not supported (e.g. XACT).
Moreover, we handle an unmanaged exception in transaction.search, when the existing objectType is not supported (e.g. XACT).