I'm not sure about the purpose of the InvalidComparisonOperationRule which seams to forbid comparison between number and object or number and arrays. Technically something like $int == $array is supported by php (and 0 == [] for instance).
Maybe the message

Comparison operation "!=" between array and 0 results in an error.

should be improved, but that's another topic.

Looking at the implementation, both isPossiblyNullableObjectType and isPossiblyNullableArrayType shouldn't use the RuleLevelHelper, because it will removed non-array/non-object on lower level and this is the reason why an error happen on level 6 (and then disappear in level 7).

Finally, I notice that currently a comparison between int and object|array is not reported.
This is easy to fix, but since I dunno the whole purpose of this rule, I prefer to ask you first @ondrejmirtes if I should fix it too.

Closes phpstan/phpstan#3364