* fix broken test `CursorCodecTest` & `PostsTreeTest` #247

Job	Run time
runs-on (macos-latest) / phan	1m 24s
runs-on (macos-latest) / phpunit-infection	2m 7s
runs-on (macos-latest) / phpcs	1m 27s
runs-on (macos-latest) / phpstan	1m 53s
runs-on (macos-latest) / php-cs-fixer	1m 17s
runs-on (macos-latest) / phpmd	1m 17s
runs-on (macos-latest) / pint	1m 23s
runs-on (macos-latest) / psalm	1m 30s
runs-on (ubuntu-latest) / phan	38s
runs-on (ubuntu-latest) / phpstan	27s
runs-on (ubuntu-latest) / phpunit-infection	1m 7s
runs-on (ubuntu-latest) / php-cs-fixer	23s
runs-on (ubuntu-latest) / phpmd	19s
runs-on (ubuntu-latest) / phpcs	17s
runs-on (ubuntu-latest) / pint	20s
runs-on (ubuntu-latest) / psalm	34s
runs-on (windows-latest) / phan	1m 41s
runs-on (windows-latest) / phpcs	1m 0s
runs-on (windows-latest) / php-cs-fixer	58s
runs-on (windows-latest) / phpmd	1m 3s
runs-on (windows-latest) / phpstan	1m 17s
runs-on (windows-latest) / phpunit-infection	2m 24s
runs-on (windows-latest) / pint	59s
runs-on (windows-latest) / psalm	55s
	26m 40s

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