Remove seemingly unnecessary benevolent union in explode extension

Author: herndlm

src/Type/Php/ExplodeFunctionDynamicReturnTypeExtension.php

@@ -17,12 +17,10 @@
 use PHPStan\Type\IntegerRangeType;
 use PHPStan\Type\IntegerType;
 use PHPStan\Type\IntersectionType;
-use PHPStan\Type\MixedType;
 use PHPStan\Type\NeverType;
 use PHPStan\Type\StringType;
 use PHPStan\Type\Type;
 use PHPStan\Type\TypeCombinator;
-use PHPStan\Type\TypeUtils;
 use function count;
 
 final class ExplodeFunctionDynamicReturnTypeExtension implements DynamicFunctionReturnTypeExtension
@@ -85,10 +83,6 @@ public function getTypeFromFunctionCall(
 			$returnType = TypeCombinator::union($returnType, new ConstantBooleanType(false));
 		}
 
-		if ($delimiterType instanceof MixedType) {
-			$returnType = TypeUtils::toBenevolentUnion($returnType);
-		}
-
 		return $returnType;
 	}