Improve type specification of subtractable types #1028
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The previous assumption was incorrect, it is not enough to just swap the sureTypes and sureNotTypes, as this can easily lead to a NeverType. In this change a SubtractableType is created instead for both which makes retains more type information in follow-up operations like union or intersect.
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Converts non-SubtractableTypes to SubtractableTypes in union to not loose subtracted type information. Sorts the SubtractableTypes in intersect to not loose subtracted type information if SubtractableTypes are intersected where not all of them have subtracted types configured.
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staabm
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Feb 22, 2022
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Closes phpstan/phpstan#6672
Related to phpstan/phpstan#6674
Not quite happy yet about the sorting, I feel there is a better way to handle this, somehow in the loop maybe, but I can't wrap my head around it right now.