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(v0.7.2)=
### 0.7.2 {small}`15 May, 2020`
#### Concatenation overhaul {smaller}`I Virshup`
- Elements of `uns` can now be merged, see {pr}`350`
- Outer joins now work for `layers` and `obsm`, see {pr}`352`
- Fill value for outer joins can now be specified
- Expect improvements in performance, see {issue}`303`
#### Functionality
- {attr}`~anndata.AnnData.obsp` and {attr}`~anndata.AnnData.varp` can now be transposed {pr}`370` {smaller}`A Wolf`
- {meth}`~anndata.AnnData.obs_names_make_unique` is now better at making values unique, and will warn if ambiguities arise {pr}`345` {smaller}`M Weiden`
- {attr}`~anndata.AnnData.obsp` is now preferred for storing pairwise relationships between observations. In practice, this means there will be deprecation warnings and reformatting applied to objects which stored connectivities under `uns["neighbors"]`. Square matrices in {attr}`~anndata.AnnData.uns` will no longer be sliced (use `.{obs,var}p` instead). {pr}`337` {smaller}`I Virshup`
- {class}`~anndata.ImplicitModificationWarning` is now exported {pr}`315` {smaller}`P Angerer`
- Better support for {class}`~numpy.ndarray` subclasses stored in `AnnData` objects {pr}`335` {smaller}`michalk8`
#### Bug fixes
- Fixed inplace modification of {class}`~pandas.Index` objects by the make unique function {pr}`348` {smaller}`I Virshup`
- Passing ambiguous keys to {meth}`~anndata.AnnData.obs_vector` and {meth}`~anndata.AnnData.var_vector` now throws errors {pr}`340` {smaller}`I Virshup`
- Fix instantiating {class}`~anndata.AnnData` objects from {class}`~pandas.DataFrame` {pr}`316` {smaller}`P Angerer`
- Fixed indexing into `AnnData` objects with arrays like `adata[adata[:, gene].X > 0]` {pr}`332` {smaller}`I Virshup`
- Fixed type of version {pr}`315` {smaller}`P Angerer`
- Fixed deprecated import from {mod}`pandas` {pr}`319` {smaller}`P Angerer`
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