Keep null for nullable scalar fields in weak mode

src/Formatter/ArrayBasedDeformatter.php

@@ -41,6 +41,9 @@ public function deserializeInt(mixed $decoded, Field $field): int|DeformatterRes
         }
 
         // Weak mode.
+        if ($field->nullable && is_null($value)) {
+            return null;
+        }
         return (int)($decoded[$field->serializedName]);
     }
 
@@ -60,6 +63,9 @@ public function deserializeFloat(mixed $decoded, Field $field): float|Deformatte
         }
 
         // Weak mode.
+        if ($field->nullable && is_null($value)) {
+            return null;
+        }
         return (float)($decoded[$field->serializedName]);
     }
 
@@ -79,6 +85,9 @@ public function deserializeBool(mixed $decoded, Field $field): bool|DeformatterR
         }
 
         // Weak mode.
+        if ($field->nullable && is_null($value)) {
+            return null;
+        }
         return (bool)($decoded[$field->serializedName]);
     }
 
@@ -98,6 +107,9 @@ public function deserializeString(mixed $decoded, Field $field): string|Deformat
         }
 
         // Weak mode.
+        if ($field->nullable && is_null($value)) {
+            return null;
+        }
         return (string)($value);
     }
 

tests/NonStrict/NonStrictNullableProperties.php

@@ -0,0 +1,22 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Crell\Serde\NonStrict;
+
+use Crell\Serde\Attributes\Field;
+
+class NonStrictNullableProperties
+{
+    public function __construct(
+        #[Field(strict: false)]
+        public readonly ?int $int = null,
+        #[Field(strict: false)]
+        public readonly ?float $float = null,
+        #[Field(strict: false)]
+        public readonly ?string $string = null,
+        #[Field(strict: false)]
+        public readonly ?bool $bool = null,
+    ) {
+    }
+}

tests/SerdeTestCases.php

@@ -11,6 +11,7 @@
 use Crell\Serde\Attributes\StaticTypeMap;
 use Crell\Serde\Attributes\TransitiveTypeField;
 use Crell\Serde\Formatter\SupportsCollecting;
+use Crell\Serde\NonStrict\NonStrictNullableProperties;
 use Crell\Serde\PropertyHandler\Exporter;
 use Crell\Serde\PropertyHandler\ObjectExporter;
 use Crell\Serde\PropertyHandler\ObjectImporter;
@@ -316,6 +317,9 @@ public static function round_trip_examples(): iterable
         yield 'empty_values' => [
             'data' => new EmptyData('beep', null),
         ];
+        yield 'non_strict_null_stays_null' => [
+            'data' => new NonStrictNullableProperties(),
+        ];
         yield 'native_object_serialization' => [
             'data' => new NativeSerUn(
                 1,