allTypesAndFields: Direct serialization of all valid fields for all valid item types
citeProcJSExport: All item types and fields as sent to citeproc-js
itemJSON: Zotero.Item::toJSON serialization of all item types and fields
translatorExport: items as presented to export translators after 4.0.27
translatorExportLegacy: items as presented to export translators before 4.0.27
(does not cover relations, collections, tags, attachments)
