fixup! Replace error-prone instanceof in Rules classes

Author: zonuexe

src/Rules/Comparison/ImpossibleCheckTypeHelper.php

@@ -70,7 +70,7 @@ public function findSpecifiedType(
 				if ($functionName === 'assert' && $argsCount >= 1) {
 					$arg = $node->getArgs()[0]->value;
 					$assertValues = ($this->treatPhpDocTypesAsCertain ? $scope->getType($arg) : $scope->getNativeType($arg))->getConstantScalarValues();
-					if (count($assertValues) === 0 || !is_bool($assertValues[0])) {
+					if (count($assertValues) !== 1 || !is_bool($assertValues[0])) {
 						return null;
 					}