Looking at https://book.cakephp.org/5.next/appendices/5-4-migration-guide.html there are quite a few elements missing compared to what is present in the 5.next branch on cakephp/cakephp - ~~BaseCommand::initialize() now running after args/options parsing, with [$this->args and $this->io available.](https://github.com/cakephp/cakephp/pull/19280)~~ https://github.com/cakephp/docs/pull/8260 - ~~`Mailer::$name` deprecation.~~ https://github.com/cakephp/docs/pull/8260 - ~~[PSR-13 link support](https://github.com/cakephp/cakephp/pull/19213) on Response and emitted Link headers.~~ #8259 - ~~New collection helpers - [keys(), values(), implode(), when(), and unless()](https://github.com/cakephp/cakephp/pull/19134)~~ #8259 - ~~New filesystem [Finder/Path APIs.](https://github.com/cakephp/cakephp/pull/19171)~~ https://github.com/cakephp/docs/pull/8260 - ~~New [PluginConfig::getInstalledPlugins() API.](https://github.com/cakephp/cakephp/pull/19208)~~ https://github.com/cakephp/docs/pull/8260 - ~~The [component-alias/default-table collision](https://github.com/cakephp/cakephp/pull/19354) warning.~~ #8259 - ~~[Stronger Security key](https://github.com/cakephp/cakephp/pull/19325) derivation option.~~ https://github.com/cakephp/docs/pull/8260 - ~~The new `cakephp/container implementation` (which still needs the [opt-in config](https://github.com/cakephp/cakephp/pull/19366))~~ https://github.com/cakephp/docs/pull/8260
Looking at https://book.cakephp.org/5.next/appendices/5-4-migration-guide.html there are quite a few elements missing compared to what is present in the 5.next branch on cakephp/cakephp
BaseCommand::initialize() now running after args/options parsing, with $this->args and $this->io available.add missing 5.4 docs #8260Mailer::$namedeprecation.PSR-13 link support on Response and emitted Link headers.Add missing 5.4 migration guide entries #8259New collection helpers - keys(), values(), implode(), when(), and unless()Add missing 5.4 migration guide entries #8259New filesystem Finder/Path APIs.add missing 5.4 docs #8260New PluginConfig::getInstalledPlugins() API.add missing 5.4 docs #8260The component-alias/default-table collision warning.Add missing 5.4 migration guide entries #8259Stronger Security key derivation option.add missing 5.4 docs #8260The newadd missing 5.4 docs #8260cakephp/container implementation(which still needs the opt-in config)