diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index 824ff8c..eb09295 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -35,7 +35,7 @@ jobs:
         continue-on-error: '${{ matrix.failure }}'
       - name: 'Psalm'
         run: 'php vendor/bin/psalm --no-cache --shepherd'
-        continue-on-error: '${{ matrix.failure }}'
+        if: always()
       - name: 'Infection'
         run: 'php vendor/bin/infection -j2 --min-msi=95'
-        continue-on-error: '${{ matrix.failure }}'
+        if: always()
diff --git a/psalm.xml b/psalm.xml
index 8e29c4f..8cbfd37 100644
--- a/psalm.xml
+++ b/psalm.xml
@@ -3,6 +3,8 @@
     errorLevel="1"
     resolveFromConfigFile="true"
     findUnusedPsalmSuppress="false"
+    findUnusedBaselineEntry="false"
+    findUnusedCode="false"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xmlns="https://getpsalm.org/schema/config"
     xsi:schemaLocation="https://getpsalm.org/schema/config vendor/vimeo/psalm/config.xsd">
@@ -11,31 +13,9 @@
         <directory name="src" />
         <directory name="tests/Psalm" />
         <ignoreFiles>
+            <file name="src/Doctrine/PlatenumDoctrineType.php" />
             <directory name="vendor" />
         </ignoreFiles>
     </projectFiles>
 
-    <issueHandlers>
-        <UnusedClosureParam errorLevel="error">
-            <errorLevel type="suppress">
-                <file name="src/Doctrine/PlatenumDoctrineType.php" />
-            </errorLevel>
-        </UnusedClosureParam>
-        <UnusedPsalmSuppress errorLevel="error">
-            <errorLevel type="suppress">
-                <file name="src/Enum/AttributeEnumTrait.php" />
-            </errorLevel>
-        </UnusedPsalmSuppress>
-        <DeprecatedMethod errorLevel="error">
-            <errorLevel type="suppress">
-                <file name="src/Doctrine/PlatenumDoctrineType.php" />
-            </errorLevel>
-        </DeprecatedMethod>
-        <DocblockTypeContradiction errorLevel="error">
-            <errorLevel type="suppress">
-                <file name="src/Enum/EnumTrait.php" /> <!-- PHP 7.2 only? -->
-            </errorLevel>
-        </DocblockTypeContradiction>
-    </issueHandlers>
-
 </psalm>
diff --git a/src/Doctrine/PlatenumDoctrineType.php b/src/Doctrine/PlatenumDoctrineType.php
index 8c194fc..83ba7ed 100644
--- a/src/Doctrine/PlatenumDoctrineType.php
+++ b/src/Doctrine/PlatenumDoctrineType.php
@@ -4,6 +4,7 @@
 
 use Doctrine\DBAL\Platforms\AbstractPlatform;
 use Doctrine\DBAL\Types\Type;
+use Thunder\Platenum\Enum\AbstractConstantsEnum;
 use Thunder\Platenum\Enum\EnumTrait;
 
 /** @psalm-suppress PropertyNotSetInConstructor, MissingConstructor */
@@ -13,7 +14,7 @@ final class PlatenumDoctrineType extends Type
     private $platenumClass;
     /** @var string */
     private $platenumAlias;
-    /** @var callable */
+    /** @var callable(mixed):mixed */
     private $platenumCallback;
     /** @psalm-var callable(array,AbstractPlatform):string */
     private $platenumSql;
@@ -46,7 +47,9 @@ public static function registerString(string $alias, string $class): void
             return (string)$value;
         };
         $sql = function(array $declaration, AbstractPlatform $platform): string {
-            return $platform->getVarcharTypeDeclarationSQL([]);
+            return method_exists($platform, 'getStringTypeDeclarationSQL')
+                ? $platform->getStringTypeDeclarationSQL([])
+                : $platform->getVarcharTypeDeclarationSQL([]);
         };
 
         self::registerCallback($alias, $class, $toString, $sql);
@@ -55,7 +58,7 @@ public static function registerString(string $alias, string $class): void
     /**
      * @param string $alias
      * @psalm-param class-string $class
-     * @param callable $callback
+     * @param callable(int|string):mixed $callback
      * @psalm-param callable(array<mixed>,AbstractPlatform):string $sql
      */
     private static function registerCallback(string $alias, string $class, callable $callback, callable $sql): void
@@ -120,8 +123,8 @@ public function convertToDatabaseValue($value, AbstractPlatform $platform)
             throw new \LogicException(sprintf($message, self::class, gettype($value)));
         }
 
-        /** @psalm-suppress MixedMethodCall */
-        return ($this->platenumCallback)($value->getValue());
+        /** @var AbstractConstantsEnum $value */
+        return call_user_func($this->platenumCallback, $value->getValue());
     }
 
     public function convertToPHPValue($value, AbstractPlatform $platform)
diff --git a/tests/DoctrineTest.php b/tests/DoctrineTest.php
index b8ab583..c2c3ebb 100644
--- a/tests/DoctrineTest.php
+++ b/tests/DoctrineTest.php
@@ -10,6 +10,7 @@
 use Doctrine\Persistence\Mapping\Driver\StaticPHPDriver;
 use Thunder\Platenum\Doctrine\PlatenumDoctrineType;
 use Thunder\Platenum\Tests\Fake\DoctrineEntity;
+use Thunder\Platenum\Tests\Fake\DoctrineExtendsEnum;
 use Thunder\Platenum\Tests\Fake\DoctrineIntEnum;
 use Thunder\Platenum\Tests\Fake\DoctrineStringEnum;
 use Thunder\Platenum\Tests\Fake\NoTraitEnum;
@@ -101,4 +102,10 @@ public function testNoTrait(): void
         $this->expectExceptionMessage('PlatenumDoctrineType allows only Platenum enumerations, `'.NoTraitEnum::class.'` given.');
         PlatenumDoctrineType::registerString('noTraitEnum', NoTraitEnum::class);
     }
+
+    public function testInheritance(): void
+    {
+        PlatenumDoctrineType::registerString('doctrineExtendsEnum', DoctrineExtendsEnum::class);
+        $this->assertTrue(true);
+    }
 }
diff --git a/tests/EnumTest.php b/tests/EnumTest.php
index 81c6ce9..2029b0a 100644
--- a/tests/EnumTest.php
+++ b/tests/EnumTest.php
@@ -65,7 +65,14 @@ public function testGetInstances(): void
         $first = $enum::fromMember('FIRST');
         $otherFirst = $enum::fromEnum($first);
 
-        $this->assertSame([$enum::FIRST(), $enum::SECOND()], $enum::getInstances());
+        $this->assertSame([$first, $enum::SECOND()], $enum::getInstances());
+    }
+
+    public function testGetInstancesCold(): void
+    {
+        $enum = $this->makeRawEnum(['FIRST' => 1, 'SECOND' => 2]);
+
+        $this->assertCount(2, $enum::getInstances());
     }
 
     public function testExceptionNonScalarValue(): void
diff --git a/tests/Fake/DoctrineExtendsBaseEnum.php b/tests/Fake/DoctrineExtendsBaseEnum.php
new file mode 100644
index 0000000..1da0c88
--- /dev/null
+++ b/tests/Fake/DoctrineExtendsBaseEnum.php
@@ -0,0 +1,7 @@
+<?php
+declare(strict_types=1);
+namespace Thunder\Platenum\Tests\Fake;
+
+abstract class DoctrineExtendsBaseEnum extends DoctrineExtendsCoreEnum
+{
+}
diff --git a/tests/Fake/DoctrineExtendsCoreEnum.php b/tests/Fake/DoctrineExtendsCoreEnum.php
new file mode 100644
index 0000000..c5e8247
--- /dev/null
+++ b/tests/Fake/DoctrineExtendsCoreEnum.php
@@ -0,0 +1,10 @@
+<?php
+declare(strict_types=1);
+namespace Thunder\Platenum\Tests\Fake;
+
+use Thunder\Platenum\Enum\ConstantsEnumTrait;
+
+abstract class DoctrineExtendsCoreEnum
+{
+    use ConstantsEnumTrait;
+}
diff --git a/tests/Fake/DoctrineExtendsEnum.php b/tests/Fake/DoctrineExtendsEnum.php
new file mode 100644
index 0000000..78cc222
--- /dev/null
+++ b/tests/Fake/DoctrineExtendsEnum.php
@@ -0,0 +1,13 @@
+<?php
+declare(strict_types=1);
+namespace Thunder\Platenum\Tests\Fake;
+
+/**
+ * @method static static ONE()
+ * @method static static TWO()
+ */
+final class DoctrineExtendsEnum extends DoctrineExtendsBaseEnum
+{
+    private const ONE = 'one';
+    private const TWO = 'two';
+}