bool|null is accepted in an if condition if you use the nullsafe operator.

[Dgame]

Bug report

bool|null is accepted in an if condition if you use the nullsafe operator.

Code snippet that reproduces the problem

No error for line 13:
https://phpstan.org/r/6866ee85-dfc4-4b09-9b39-83861c2cdda6

Expected output

I expected the error Only booleans are allowed in an if condition, bool|null given.

[ondrejmirtes]

Fixed by: phpstan/phpstan-src#687

[github-actions]

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