+ classes `BasePostKey`, `PostKeyWithParent`, `(Sub)?Reply` & `Thread… #214

Job	Run time
runs-on (macos-latest) / phpmd	1m 33s
runs-on (macos-latest) / phpcs	1m 27s
runs-on (macos-latest) / php-cs-fixer	1m 22s
runs-on (macos-latest) / phan	1m 24s
runs-on (macos-latest) / phpstan	1m 42s
runs-on (macos-latest) / phpunit-infection	2m 26s
runs-on (macos-latest) / pint	1m 36s
runs-on (macos-latest) / psalm	1m 37s
runs-on (ubuntu-latest) / phan	44s
runs-on (ubuntu-latest) / php-cs-fixer	25s
runs-on (ubuntu-latest) / phpcs	17s
runs-on (ubuntu-latest) / phpmd	24s
runs-on (ubuntu-latest) / phpstan	32s
runs-on (ubuntu-latest) / phpunit-infection	1m 3s
runs-on (ubuntu-latest) / pint	20s
runs-on (ubuntu-latest) / psalm	27s
runs-on (windows-latest) / phan	1m 54s
runs-on (windows-latest) / phpcs	1m 6s
runs-on (windows-latest) / php-cs-fixer	59s
runs-on (windows-latest) / phpmd	55s
runs-on (windows-latest) / phpstan	1m 2s
runs-on (windows-latest) / phpunit-infection	2m 8s
runs-on (windows-latest) / psalm	59s
runs-on (windows-latest) / pint	57s
	27m 19s

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