[RIS] Slightly better handling of \u2028. Add test case.
Test case shouldn't break anything if we don't need to re-stringify it outside of Scaffold (which is doesn't look like we do), but it does require zotero/scaffold@3e4d1d80dbcf8606211e3e925d61e86145935d7b to update tests
[RIS] Update tests. Nothing actually changed.