Try

Author: VincentLanglet

src/Type/Doctrine/Descriptors/DecimalType.php

@@ -4,10 +4,8 @@
 
 use Doctrine\DBAL\Connection;
 use PHPStan\Doctrine\Driver\DriverDetector;
-use PHPStan\Type\Accessory\AccessoryNumericStringType;
 use PHPStan\Type\FloatType;
 use PHPStan\Type\IntegerType;
-use PHPStan\Type\IntersectionType;
 use PHPStan\Type\StringType;
 use PHPStan\Type\Type;
 use PHPStan\Type\TypeCombinator;
@@ -58,10 +56,7 @@ public function getDatabaseInternalTypeForDriver(Connection $connection): Type
 			DriverDetector::PGSQL,
 			DriverDetector::PDO_PGSQL,
 		], true)) {
-			return new IntersectionType([
-				new StringType(),
-				new AccessoryNumericStringType(),
-			]);
+			return (new FloatType())->toString();
 		}
 
 		// not yet supported driver, return the old implementation guess