* Breaking: Removed `OperationInterface::getReason` as the data was not accurate
* Added automatic removal of packages which are not required anymore whenever an update is done, this will purge packages previously left over by partial updates and `require`/`remove`
* Added shorthand aliases `-w` for `--with-dependencies` and `-W` for `--with-all-dependencies` on `update`/`require`/`remove` commands
* Added `COMPOSER_DEBUG_EVENTS=1` env var support for plugin authors to figure out which events are triggered when
* Added `setCustomCacheKey` to `PreFileDownloadEvent` and fixed a cache bug for integrations changing the processed url of package archives
* Added `Composer\Util\SyncHelper` for plugin authors to deal with async Promises more easily
* Added `$composer->getLoop()->getHttpDownloader()` to get access to the main HttpDownloader instance in plugins
* Added a non-zero exit code (2) and warning to `remove` command when a package to be removed could not be removed
* Added `--apcu-autoloader-prefix` (or `--apcu-prefix` for `dump-autoload` command) flag to let people use apcu autoloading in a deterministic output way if that is needed
* Fixed version guesser to look at remote branches as well as local ones
* Lots of minor bug fixes and improvements
### [2.0.0-RC1] 2020-09-10
* Added more advanced filtering to avoid loading all versions of all referenced packages when resolving dependencies, which should reduce memory usage further in some cases
Jordi Boggiano
4 years ago