This release fixes [deprecation warnings that come with the newer PHP 7.4 release](https://wiki.php.net/rfc/deprecations_php_7_4), and completely covers the test suite with type checks. With this release, no types coming from ProxyManager should be inferred as `mixed` anymore, allowing for safer, faster and more reliable downstream development. Total issues resolved: **11** - [467: Covered tests via static types through psalm](https://github.com/Ocramius/ProxyManager/pull/467) thanks to @Ocramius - [475: Removed reliance on `Closure::bind(_, null)`](https://github.com/Ocramius/ProxyManager/pull/475) thanks to @Ocramius - [477: Update phpunit/phpunit requirement from ^8.2.2 to ^8.2.5](https://github.com/Ocramius/ProxyManager/pull/477) thanks to @dependabot-preview[bot] - [478: Update symfony/console requirement from ^4.3.1 to ^4.3.3](https://github.com/Ocramius/ProxyManager/pull/478) thanks to @dependabot-preview[bot] - [479: Update infection/infection requirement from ^0.13.2 to ^0.13.4](https://github.com/Ocramius/ProxyManager/pull/479) thanks to @dependabot-preview[bot] - [480: Update ocramius/package-versions requirement from ^1.4.0 to ^1.5.1](https://github.com/Ocramius/ProxyManager/pull/480) thanks to @dependabot-preview[bot] - [481: Update couscous/couscous requirement from ^1.7.1 to ^1.7.2](https://github.com/Ocramius/ProxyManager/pull/481) thanks to @dependabot-preview[bot] - [484: Fix deprecation PHP 7.4](https://github.com/Ocramius/ProxyManager/pull/484) thanks to @nicolas-grekas - [485: Update phpunit/phpunit requirement from ^8.2.2 to ^8.3.3](https://github.com/Ocramius/ProxyManager/pull/485) thanks to @dependabot-preview[bot] - [486: Remove process isolation from tests around file writer generators](https://github.com/Ocramius/ProxyManager/pull/486) thanks to @Ocramius - [487: Update vimeo/psalm requirement from 3.4.6 to 3.4.11](https://github.com/Ocramius/ProxyManager/pull/487) thanks to @dependabot-preview[bot]