Update MutatingScope.php

Author: staabm

src/Analyser/MutatingScope.php

@@ -3237,7 +3237,7 @@ public function filterBySpecifiedTypes(SpecifiedTypes $specifiedTypes): self
 							$conditionalExpression->getTypeHolder()->getCertainty()->yes()
 							&& $specifiedHolder->getCertainty()->yes()
 							&& $conditionalTypeHolder->getCertainty()->yes()
-							&& ($guardType instanceof UnionType || $guardType instanceof IntegerRangeType)
+							&& $guardType->isScalar()->yes()
 							&& $guardType->isSuperTypeOf($specifiedHolder->getType())->yes()
 						) {
 							$subtypeMatch = true;