There was come code missed on #2 please review this patch
Closed: outdated
11.0 🔥
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Irregargless of #11 there are no instances of setup() in core without a return type hint.
$ grep --exclude-dir={node_modules,vendor} --exclude=\*.cspellcache -r "function setUp() {" core
$
Therefor, closing as outdated.