add enum label string type check

Author: pfilsx

src/DBAL/Contract/EnumInterface.php

@@ -7,7 +7,7 @@
 interface EnumInterface
 {
     /**
-     * @return array<int|string>
+     * @return string[]
      */
     public static function cases(): array;
 }

src/Tools/EnumTool.php

@@ -19,7 +19,7 @@ final class EnumTool
      */
     public static function getEnumTypeNameFromClassName(string $className): string
     {
-        self::checkEnumExists($className);
+        self::checkEnumExistsAndValid($className);
 
         $classNameParts = \explode('\\', $className);
 
@@ -33,7 +33,7 @@ public static function getEnumTypeNameFromClassName(string $className): string
      */
     public static function getEnumLabelsByClassName(string $className): array
     {
-        self::checkEnumExists($className);
+        self::checkEnumExistsAndValid($className);
 
         return \array_map(
             static function (mixed $case) {
@@ -50,18 +50,35 @@ static function (mixed $case) {
         );
     }
 
-    private static function checkEnumExists(string $className): void
+    private static function checkEnumExistsAndValid(string $className): void
     {
         if (self::$checkMap[$className] ?? false) {
             return;
         }
 
-        if (!\enum_exists($className) && (!\class_exists($className) || is_subclass_of($className, EnumInterface::class))) {
+        if (!\enum_exists($className) && (!\class_exists($className) || !is_subclass_of($className, EnumInterface::class))) {
             throw new InvalidArgumentException(
                 sprintf('Invalid enum className specified: %s. Enum class has to be a php8 enum or implements %s', $className, EnumInterface::class)
             );
         }
 
+        if (enum_exists($className) && self::isIntBackedEnum($className)) {
+            throw new InvalidArgumentException(
+                sprintf('Invalid enum className specified: %s. PostgreSQL supports only string values for enums', $className)
+            );
+        }
+
         self::$checkMap[$className] = true;
     }
+
+    /**
+     * @param class-string<\UnitEnum> $className
+     * @return bool
+     */
+    private static function isIntBackedEnum(string $className): bool
+    {
+        $fistCase = ($className::cases()[0] ?? null);
+
+        return $fistCase instanceof \BackedEnum && is_int($fistCase->value);
+    }
 }