| ⇢ | A | PluginTest added |
| ⇢ | B | PluginTest::testWhoops() added | |
| ⇢ | A | Development::createHandler() added | |
| ⇢ | A | ErrorLog::__construct() added | |
| ⇢ | A | Plugin::registerErrorHandler() added | |
| C | ↛ | Development::createBacktrace() removed | |
| B | ↛ | Development::receiveCodeFragment() removed | |
| B | ↛ | Development::getBacktraceStepArguments() removed | |
| B | ↛ | Development::displayDeveloperOutput() removed | |
| B | ↛ | Development::linkClass() removed | |
| A | ↛ | Plugin::onPluginsLoaded() removed | |
| A | ↛ | Development::tag() removed |