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# Changelog for [`base` package](http://hackage.haskell.org/package/base)
-## next *TBA*
+## 4.10.0.0 *April 2017*
* Bundled with GHC *TBA*
* `Data.Type.Bool.Not` given a type family dependency (#12057).
@@ -65,6 +65,10 @@
* `Data.Type.Equality` now provides a kind heterogeneous type equality
evidence type, `(:~~:)`.
+ * The `CostCentresXML` constructor of `GHC.RTS.Flags.DoCostCentres` has been
+ replaced by `CostCentresJSON` due to the new JSON export format supported by
+ the cost centre profiler.
+
## 4.9.0.0 *May 2016*
* Bundled with GHC 8.0