:top: Will this also add support for Foo<> notation?
Yes
Next PhpStorm EAP will support intersection types on parser level (but still treat them as unions), so this is more actual than ever. :)
https://youtrack.jetbrains.com/issue/WI-39419#focus=streamItem-27-3061342-0-0
PHPStan support is out https://github.com/phpstan/phpstan/commit/73cc2118c873c082aa8fbe7b037188ec4d04e7a1
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Most helpful comment
Yes