Issue #1443070 by CrashTest_, bluegriff | Dave Reid: Added support for popular e-book formats, Google web formats, mkv and mka in file_default_mimetype_mapping().
Issue #2278583 by nlisgo, Berdir, joshi.rohit100 | Fabianx: Fixed field_has_data looks at current data instead of revisioning data: this can lead to data loss.