fix refining lowercase string and non-empty-string together #7844
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This should fix #7843 (on Psalm 5 though...)
For the explanation: Psalm assertions works well when one of the two type is a super type of another (isContainedBy method). When that happens, Psalm just takes the narrower type and goes on. Issues arise when none of the type is completely included in another. (A great example is the condition just above with
int<0, 10>
andint<5, 15>
which should result inint<5, 10>
but need to be handled separately).This is the same with non-empty-string and lowercase-string, the intersection of both is possible within Psalm's type system (non-empty-lowercase-string) but none is completely included in the other