Notably, an issue in the 3DS version that would lead to the 3DS crashing when exiting the emulator, and an issue that would lead mGBA to appearing in a language other than English by default on macOS despite the system language being set to English, have been fixed.
This version is a bugfix release, which contains many stability and accuracy fixes. A new release of mGBA, version 0.8.4, is available.
