Prep 0.9rc1 (#919)

* Release notes clean up
* Format fixes + bug fixes
* Add dummy awkward-array-view class

anndata/_core/views.py

@@ -257,7 +257,9 @@ def as_view_awkarray(array, view_args):
     ak.behavior["AwkwardArrayView"] = AwkwardArrayView
 
 except ImportError:
-    pass
+
+    class AwkwardArrayView:
+        pass
 
 
 def _resolve_idxs(old, new, adata):

docs/release-notes/0.9.0.rst

@@ -1,33 +1,44 @@
-0.9.0 :small:`the future`
-~~~~~~~~~~~~~~~~~~~~~~~~~
+0.9.0.rc1 :small:`2023-02-21`
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 .. rubric:: Features
 
 
-* Unordered categorical columns are no longer cast to object during :func:`anndata.concat` :pr:`763` :user:`ivirshup`
-* Added support for dask arrays :pr:`813` :user:`syelman` :user:`rahulbshrestha`
-* `obsm`, `varm` and `uns` can now hold `AwkwardArrays <https://awkward-array.org/quickstart.html>`__ :pr:`647` :user:`giovp`, :user:`grst`, :user:`ivirshup`
-* Better error messages during IO :pr:`734` :user:`flying-sheep`, :user:`ivirshup`
+- Added experimental support for dask arrays :pr:`813` :user:`syelman` :user:`rahulbshrestha`
+- `obsm`, `varm` and `uns` can now hold `AwkwardArrays <https://awkward-array.org/quickstart.html>`__ :pr:`647` :user:`giovp`, :user:`grst`, :user:`ivirshup`
+- Added experimental functions :func:`anndata.experimental.read_dispatched` and :func:`anndata.experimental.write_dispatched` which allow customizing IO with a callback :pr:`873` :user:`ilan-gold` :user:`ivirshup`
+- Better error messages during IO :pr:`734` :user:`flying-sheep`, :user:`ivirshup`
+- Unordered categorical columns are no longer cast to object during :func:`anndata.concat` :pr:`763` :user:`ivirshup`
 
 .. rubric:: Documentation
 
-* :doc:`New tutorial <../tutorials/notebooks/anndata_dask_array>` on using `dask.array` with `AnnData` :pr:`886` :user:`syelman`
-* :doc:`File format description </fileformat-prose>` now includes a more formal specification :pr:`882` :user:`ivirshup`
-* Expanded docstring more documentation for ``backed`` argument of :func:`anndata.read_h5ad` :pr:`812` :user:`jeskowagner`
-* Documented how to use alternative compression methods for the `h5ad` file format, see :meth:`AnnData.write_h5ad() <anndata.AnnData.write_h5ad>` :pr:`857` :user:`nigeil`
+- New tutorials for experimental features
 
-.. rubric:: Breaking changes
+    - :doc:`/tutorials/notebooks/anndata_dask_array` – :pr:`886` :user:`syelman`
+    - :doc:`/tutorials/notebooks/{read,write}_dispatched` – :pr:`scverse/anndata-tutorials#17` :user:`ilan-gold`
+    - :doc:`/tutorials/notebooks/awkward-arrays` – :pr:`scverse/anndata-tutorials#15` :user:`grst`
+- :doc:`File format description </fileformat-prose>` now includes a more formal specification :pr:`882` :user:`ivirshup`
+- :doc:`/interoperability`: new page on interoperability with other packages :pr:`831` :user:`ivirshup`
+- Expanded docstring more documentation for ``backed`` argument of :func:`anndata.read_h5ad` :pr:`812` :user:`jeskowagner`
+- Documented how to use alternative compression methods for the `h5ad` file format, see :meth:`AnnData.write_h5ad() <anndata.AnnData.write_h5ad>` :pr:`857` :user:`nigeil`
+- General typo corrections 😅 :pr:`870` :user:`folded`
 
-* The `AnnData` `dtype` argument no longer defaults to `float32` :pr:`854` :user:`ivirshup`
+.. rubric:: Breaking changes
 
-.. rubric:: Bug fixes
+- The `AnnData` `dtype` argument no longer defaults to `float32` :pr:`854` :user:`ivirshup`
+- Previously deprecated `force_dense` arugment :meth:`AnnData.write_h5ad() <anndata.AnnData.write_h5ad>` has been removed. :pr:`855` :user:`ivirshup`
+- Previously deprecated behaviour around storing adjacency matrices in `uns` has been removed :pr:`866` :user:`ivirshup`
 
-.. rubric:: Updates
+.. rubric:: Other updates
 
-* Bump minimum python version to 3.8 :pr:`820` :user:`ivirshup`
+- Bump minimum python version to 3.8 :pr:`820` :user:`ivirshup`
 
 .. rubric:: Deprecations
 
-* :meth:`AnnData.concatenate() <anndata.AnnData.concatenate>` is now deprecated in favour of :func:`anndata.concat` :pr:`845` :user:`ivirshup`
-* Previously deprecated `force_dense` arugment :meth:`AnnData.write_h5ad() <anndata.AnnData.write_h5ad>` has been removed. :pr:`855` :user:`ivirshup`
-* Previously deprecate behaviour around storing adjacency matrices in `uns` has been removed :pr:`866` :user:`ivirshup`
+- :meth:`AnnData.concatenate() <anndata.AnnData.concatenate>` is now deprecated in favour of :func:`anndata.concat` :pr:`845` :user:`ivirshup`
+
+.. rubric:: Bug fixes
+
+- Fixed order dependent outer concatenation bug :pr:`904` :user:`ivirshup`, reported by :user:`szalata`
+- Fixed bug in renaming categories :pr:`790` :user:`ivirshup`, reported by :user:`perrin-isir`
+- Fixed IO bug when keys in `uns` ended in `_categories` :pr:`806` :user:`ivirshup`, reported by :user:`Hrovatin`