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`Full list of changes from v3.1 <https://github.com/django-compressor/django-compressor/compare/3.1...4.0>`_
- Fix intermittent No such file or directory errors by changing strategy to
deal with duplicate filenames in CompressorFileStorage
Note: if your project has a custom storage backend following the example of
`CachedS3Boto3Storage` from the "Remote Storages" documentation, it will need
to be updated to call `save` instead of `_save` to work properly after this
change to `CompressorFileStorage`.
- Deprecate SlimItFilter, stop testing it with Python 3.7 or higher