Fix mixed with subtraction not being a super type of never #98
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Fixes phpstan/phpstan#2443
The return of
array_filter($foo)has a type ofarray<mixed,mixed~0|0.0|''|false|null|array{}>which was not being regarded as a super type of an empty array.I've also adjusted the
ArrayType::describe()method to ensure mixed types with a subtracted type is explained.