+* Disable dynamic extension support by default for CMake.
+
## 6.2.1 (6/4/2019)
### Bug Fixes
* Fix flush's/compaction's merge processing logic which allowed `Put`s covered by range tombstones to reappear. Note `Put`s may exist even if the user only ever called `Merge()` due to an internal conversion during compaction to the bottommost level.