fixup! Replace error-prone instanceof in Rules classes

Author: zonuexe

src/Rules/Comparison/ConstantLooseComparisonRule.php

@@ -8,6 +8,7 @@
 use PHPStan\Rules\Rule;
 use PHPStan\Rules\RuleErrorBuilder;
 use PHPStan\Type\VerbosityLevel;
+use function in_array;
 use function sprintf;
 
 /**
@@ -56,7 +57,7 @@ public function processNode(Node $node, Scope $scope): array
 			return $ruleErrorBuilder->treatPhpDocTypesAsCertainTip();
 		};
 
-		if ($nodeType->getConstantScalarValues()[0] === false) {
+		if (in_array(false, $nodeType->getConstantScalarValues(), true)) {
 			return [
 				$addTip(RuleErrorBuilder::message(sprintf(
 					'Loose comparison using %s between %s and %s will always evaluate to false.',