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Features
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- Implement `__delitem__` to delete entries from a data view. `3 <https://github.com/sarugaku/plette/issues/3>`_
- Add slicing support to `DataViewSequence`. It is not possible to get, set, or
delete a slice from it. For `__getitem__`, the return value’s type would match
the sliced `DataViewSequence`. `4 <https://github.com/sarugaku/plette/issues/4>`_