fix(mapper): preserve native scalar values

docs/2-features/01-mapper.md

@@ -242,7 +242,7 @@ final readonly class AddressSerializer implements Serializer
 
 :::
 
-Of course, Tempest provides casters and serializers for the most common data types, including arrays, booleans, dates, enumerations, integers and value objects.
+Of course, Tempest provides casters and serializers for the most common data types, including arrays, booleans, dates, enumerations, floats, integers and value objects.
 
 ### Registering casters and serializers globally
 

packages/mapper/src/Serializer.php

@@ -7,7 +7,7 @@
 interface Serializer
 {
     /**
-     * Serializes the given input into a string, array, or integer.
+     * Serializes the given input into an array, boolean, float, integer, or string.
      */
-    public function serialize(mixed $input): array|string|int;
+    public function serialize(mixed $input): array|bool|float|int|string;
 }

packages/mapper/src/Serializers/BooleanSerializer.php

@@ -23,12 +23,12 @@ public static function accepts(PropertyReflector|TypeReflector $input): bool
         return in_array($type->getName(), ['bool', 'boolean'], strict: true);
     }
 
-    public function serialize(mixed $input): string
+    public function serialize(mixed $input): bool
     {
         if (! is_bool($input)) {
             throw new ValueCouldNotBeSerialized('boolean');
         }
 
-        return $input ? 'true' : 'false';
+        return $input;
     }
 }

packages/mapper/src/Serializers/FloatSerializer.php

@@ -23,12 +23,12 @@ public static function accepts(PropertyReflector|TypeReflector $input): bool
         return in_array($type->getName(), ['double', 'float'], strict: true);
     }
 
-    public function serialize(mixed $input): string
+    public function serialize(mixed $input): float
     {
         if (! is_float($input)) {
             throw new ValueCouldNotBeSerialized('float');
         }
 
-        return (string) $input;
+        return $input;
     }
 }

packages/mapper/src/Serializers/IntegerSerializer.php

@@ -23,12 +23,12 @@ public static function accepts(PropertyReflector|TypeReflector $input): bool
         return in_array($type->getName(), ['int', 'integer'], strict: true);
     }
 
-    public function serialize(mixed $input): string
+    public function serialize(mixed $input): int
     {
         if (! is_int($input)) {
             throw new ValueCouldNotBeSerialized('integer');
         }
 
-        return (string) $input;
+        return $input;
     }
 }

tests/Integration/Mapper/Fixtures/ObjectWithScalarValues.php

@@ -0,0 +1,17 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Tempest\Integration\Mapper\Fixtures;
+
+use Tempest\Mapper\Strict;
+
+#[Strict]
+final class ObjectWithScalarValues
+{
+    public function __construct(
+        public bool $active,
+        public float $score,
+        public int $count,
+    ) {}
+}

tests/Integration/Mapper/Mappers/ObjectToArrayMapperTest.php

@@ -9,6 +9,7 @@
 use Tests\Tempest\Integration\Mapper\Fixtures\ObjectA;
 use Tests\Tempest\Integration\Mapper\Fixtures\ObjectWithJsonSerialize;
 use Tests\Tempest\Integration\Mapper\Fixtures\ObjectWithNullableProperties;
+use Tests\Tempest\Integration\Mapper\Fixtures\ObjectWithScalarValues;
 
 use function Tempest\Mapper\map;
 
@@ -43,10 +44,29 @@ public function object_with_nullable_properties_to_array(): void
         $this->assertSame(
             [
                 'a' => 'a',
-                'b' => '3.1416',
+                'b' => 3.1416,
                 'c' => null,
             ],
             $array,
         );
     }
+
+    #[Test]
+    public function object_with_scalar_values_to_array(): void
+    {
+        $array = map(new ObjectWithScalarValues(
+            active: true,
+            score: 1.5,
+            count: 3,
+        ))->toArray();
+
+        $this->assertSame(
+            [
+                'active' => true,
+                'score' => 1.5,
+                'count' => 3,
+            ],
+            $array,
+        );
+    }
 }

tests/Integration/Mapper/Mappers/ObjectToJsonMapperTest.php

@@ -7,6 +7,7 @@
 use PHPUnit\Framework\Attributes\Test;
 use Tests\Tempest\Integration\FrameworkIntegrationTestCase;
 use Tests\Tempest\Integration\Mapper\Fixtures\ObjectA;
+use Tests\Tempest\Integration\Mapper\Fixtures\ObjectWithScalarValues;
 
 use function Tempest\Mapper\map;
 
@@ -22,4 +23,23 @@ public function object_to_json(): void
 
         $this->assertSame('{"a":"a","b":"b"}', $json);
     }
+
+    #[Test]
+    public function object_with_scalar_values_to_json(): void
+    {
+        $json = map(new ObjectWithScalarValues(
+            active: true,
+            score: 1.5,
+            count: 3,
+        ))->toJson();
+
+        $this->assertSame(
+            [
+                'active' => true,
+                'score' => 1.5,
+                'count' => 3,
+            ],
+            json_decode($json, associative: true, flags: JSON_THROW_ON_ERROR),
+        );
+    }
 }

tests/Integration/Mapper/Serializers/ArrayOfObjectsSerializerTest.php

@@ -19,11 +19,11 @@ public function serialize(): void
                 [
                     'stringProp' => 'a',
                     'stringableProp' => 'a',
-                    'intProp' => '1',
+                    'intProp' => 1,
                     'nullableIntProp' => null,
-                    'floatProp' => '0.1',
+                    'floatProp' => 0.1,
                     'nullableFloatProp' => null,
-                    'boolProp' => 'true',
+                    'boolProp' => true,
                     'nullableBoolProp' => null,
                     'arrayProp' => '["a"]',
                     'serializeWithProp' => 'aa',

tests/Integration/Mapper/Serializers/BooleanSerializerTest.php

@@ -13,12 +13,12 @@ final class BooleanSerializerTest extends TestCase
     public function serialize(): void
     {
         $this->assertSame(
-            'true',
+            true,
             new BooleanSerializer()->serialize(true),
         );
 
         $this->assertSame(
-            'false',
+            false,
             new BooleanSerializer()->serialize(false),
         );
     }

tests/Integration/Mapper/Serializers/FloatSerializerTest.php

@@ -13,7 +13,7 @@ final class FloatSerializerTest extends TestCase
     public function serialize(): void
     {
         $this->assertSame(
-            '0.1',
+            0.1,
             new FloatSerializer()->serialize(0.1),
         );
     }

tests/Integration/Mapper/Serializers/IntegerSerializerTest.php

@@ -13,7 +13,7 @@ final class IntegerSerializerTest extends TestCase
     public function serialize(): void
     {
         $this->assertSame(
-            '1',
+            1,
             new IntegerSerializer()->serialize(1),
         );
     }