Fix #782

src/Casts/BuiltinTypeCast.php

@@ -0,0 +1,38 @@
+<?php
+
+namespace Spatie\LaravelData\Casts;
+
+use Spatie\LaravelData\Support\Creation\CreationContext;
+use Spatie\LaravelData\Support\DataProperty;
+
+class BuiltinTypeCast implements Cast, IterableItemCast
+{
+    /**
+     * @param 'bool'|'int'|'float'|'array'|'string' $type
+     */
+    public function __construct(
+        protected string $type,
+    ) {
+    }
+
+    public function cast(DataProperty $property, mixed $value, array $properties, CreationContext $context): mixed
+    {
+        return $this->runCast($value);
+    }
+
+    public function castIterableItem(DataProperty $property, mixed $value, array $properties, CreationContext $context): mixed
+    {
+        return $this->runCast($value);
+    }
+
+    protected function runCast(mixed $value): mixed
+    {
+        return match ($this->type) {
+            'bool' => (bool) $value,
+            'int' => (int) $value,
+            'float' => (float) $value,
+            'array' => (array) $value,
+            'string' => (string) $value,
+        };
+    }
+}

src/DataPipes/CastPropertiesDataPipe.php

@@ -3,6 +3,7 @@
 namespace Spatie\LaravelData\DataPipes;
 
 use Illuminate\Support\Enumerable;
+use Spatie\LaravelData\Casts\BuiltinTypeCast;
 use Spatie\LaravelData\Casts\IterableItemCast;
 use Spatie\LaravelData\Casts\Uncastable;
 use Spatie\LaravelData\Enums\DataTypeKind;
@@ -207,6 +208,10 @@ protected function findCastForIterableItems(
             }
         }
 
+        if(in_array($property->type->iterableItemType, ['bool', 'int', 'float', 'array', 'string'])) {
+            return new BuiltinTypeCast($property->type->iterableItemType);
+        }
+
         return null;
     }
 }

tests/CreationTest.php

@@ -1082,6 +1082,39 @@ public function __invoke(SimpleData $data)
         ->toEqual(['a', 'collection']);
 })->skip(fn () => config('data.features.cast_and_transform_iterables') === false);
 
+it('will cast iterables into default types', function () {
+    $dataClass = new class () extends Data {
+        /** @var array<int, string> */
+        public array $strings;
+
+        /** @var array<int, bool> */
+        public array $bools;
+
+        /** @var array<int, int> */
+        public array $ints;
+
+        /** @var array<int, float> */
+        public array $floats;
+
+        /** @var array<int, array> */
+        public array $arrays;
+    };
+
+    $data = $dataClass::from([
+        'strings' => ['Hello', 42, 3.14, true, '0', 'false'],
+        'bools' => ['Hello', 42, 3.14, true, ['nested'], '0', 'false'],
+        'ints' => ['Hello', 42, 3.14, true, ['nested'], '0', 'false'],
+        'floats' => ['Hello', 42, 3.14, true, ['nested'], '0', 'false'],
+        'arrays' => ['Hello', 42, 3.14, true, ['nested'], '0', 'false'],
+    ]);
+
+    expect($data->strings)->toBe(['Hello', '42', '3.14', '1', '0', 'false']);
+    expect($data->bools)->toBe([true, true, true, true, true, false, true]);
+    expect($data->ints)->toBe([0, 42, 3, 1, 1, 0, 0]);
+    expect($data->floats)->toBe([0.0, 42.0, 3.14, 1.0, 1.0, 0.0, 0.0]);
+    expect($data->arrays)->toEqual([['Hello'], [42], [3.14], [true], ['nested'], ['0'], ['false']]);
+})->skip(fn () => config('data.features.cast_and_transform_iterables') === false);
+
 it('keeps the creation context path up to date', function () {
     class TestCreationContextCollectorDataPipe implements DataPipe
     {