fixup! Replace error-prone instanceof in Rules classes

Author: zonuexe

src/Rules/Variables/CompactVariablesRule.php

@@ -6,7 +6,6 @@
 use PHPStan\Analyser\Scope;
 use PHPStan\Rules\Rule;
 use PHPStan\Rules\RuleErrorBuilder;
-use PHPStan\Type\Constant\ConstantArrayType;
 use PHPStan\Type\Constant\ConstantStringType;
 use PHPStan\Type\Type;
 use function array_merge;
@@ -70,11 +69,11 @@ public function processNode(Node $node, Scope $scope): array
 	 */
 	private function findConstantStrings(Type $type): array
 	{
-		if (count($type->getConstantStrings()) > 0) {
+		if (count($type->getConstantStrings()) === 1) {
 			return $type->getConstantStrings();
 		}
 
-		if (count($type->getConstantArrays()) > 1) {
+		if (count($type->getConstantArrays()) === 1) {
 			$result = [];
 			foreach ($type->getConstantArrays()[0]->getValueTypes() as $valueType) {
 				$constantStrings = $this->findConstantStrings($valueType);