Fix Array_ expr type resolving with unpacked array items #1586
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Closes phpstan/phpstan#7724
The problem was the missing
$optionalarg for the ConstantArrayTypeBuilder::setOffsetValueType for the first conditional handling string keys. Unpacked array item values are always optional in that context as long as the array is not iterable at least once.UPDATE: One more thing was looking weird to me which I fixed in the second commit. I removed the check of
$valueType->getIterableValueType()->isIterableAtLeastOnce()which goes too far if I'm not mistaken. As the iterableValueType does not influence the outer array non-emptyness basically. See the affected test files for bug-5287