Issue with union types in arrays

[moufmouf]

There seems to be a bug with union types in arrays or on iterators:

    /**
     * @Query(name="getProduct")
     * @return (\TheCodingMachine\GraphQLite\Fixtures\Integration\Models\Product|\TheCodingMachine\GraphQLite\Fixtures\Integration\Models\SpecialProduct)[]
     */
    public function getProducts2(): ArrayIterator
    {
        return new ArrayIterator([new SpecialProduct('Special box', 10.99), new SpecialProduct('Special box', 10.99)]);
    }

This causes this exception:

TheCodingMachine\GraphQLite\TypeMappingRuntimeException: Return type in TheCodingMachine\GraphQLite\Fixtures\Integration\Controllers\ProductController::getProducts2 is type-hinted to array. Please provide an additional @return in the PHPDoc block to further specify the type of the array. For instance: @return string[]

/home/david/projects/sandbox/graphql-controllers/src/TypeMappingRuntimeException.php:123
/home/david/projects/sandbox/graphql-controllers/src/Mappers/Parameters/TypeHandler.php:100
/home/david/projects/sandbox/graphql-controllers/src/FieldsBuilder.php:297
/home/david/projects/sandbox/graphql-controllers/src/FieldsBuilder.php:88
/home/david/projects/sandbox/graphql-controllers/src/AggregateControllerQueryProvider.php:43
/home/david/projects/sandbox/graphql-controllers/src/GlobControllerQueryProvider.php:121
/home/david/projects/sandbox/graphql-controllers/src/AggregateQueryProvider.php:34
/home/david/projects/sandbox/graphql-controllers/src/AggregateQueryProvider.php:35
/home/david/projects/sandbox/graphql-controllers/src/Schema.php:36
/home/david/projects/sandbox/graphql-controllers/vendor/webonyx/graphql-php/src/Type/Definition/FieldDefinition.php:90
/home/david/projects/sandbox/graphql-controllers/vendor/webonyx/graphql-php/src/Type/Definition/ObjectType.php:151
/home/david/projects/sandbox/graphql-controllers/vendor/webonyx/graphql-php/src/Utils/TypeInfo.php:180
/home/david/projects/sandbox/graphql-controllers/vendor/webonyx/graphql-php/src/Type/Schema.php:213
/home/david/projects/sandbox/graphql-controllers/vendor/webonyx/graphql-php/src/Type/Schema.php:199
/home/david/projects/sandbox/graphql-controllers/vendor/webonyx/graphql-php/src/Type/SchemaValidationContext.php:244
/home/david/projects/sandbox/graphql-controllers/vendor/webonyx/graphql-php/src/Type/Schema.php:517
/home/david/projects/sandbox/graphql-controllers/vendor/webonyx/graphql-php/src/Type/Schema.php:469
/home/david/projects/sandbox/graphql-controllers/tests/SchemaFactoryTest.php:144
/home/david/projects/sandbox/graphql-controllers/tests/SchemaFactoryTest.php:50

Caused by
TheCodingMachine\GraphQLite\TypeMappingRuntimeException: Don't know how to handle type (\TheCodingMachine\GraphQLite\Fixtures\Integration\Models\Product|\TheCodingMachine\GraphQLite\Fixtures\Integration\Models\SpecialProduct)[]

/home/david/projects/sandbox/graphql-controllers/src/TypeMappingRuntimeException.php:28
/home/david/projects/sandbox/graphql-controllers/src/Mappers/Parameters/TypeHandler.php:361
/home/david/projects/sandbox/graphql-controllers/src/Mappers/Parameters/TypeHandler.php:238
/home/david/projects/sandbox/graphql-controllers/src/Mappers/Parameters/TypeHandler.php:325
/home/david/projects/sandbox/graphql-controllers/src/Mappers/Parameters/TypeHandler.php:212
/home/david/projects/sandbox/graphql-controllers/src/Mappers/Parameters/TypeHandler.php:98
/home/david/projects/sandbox/graphql-controllers/src/FieldsBuilder.php:297
/home/david/projects/sandbox/graphql-controllers/src/FieldsBuilder.php:88
/home/david/projects/sandbox/graphql-controllers/src/AggregateControllerQueryProvider.php:43
/home/david/projects/sandbox/graphql-controllers/src/GlobControllerQueryProvider.php:121
/home/david/projects/sandbox/graphql-controllers/src/AggregateQueryProvider.php:34
/home/david/projects/sandbox/graphql-controllers/src/AggregateQueryProvider.php:35
/home/david/projects/sandbox/graphql-controllers/src/Schema.php:36
/home/david/projects/sandbox/graphql-controllers/vendor/webonyx/graphql-php/src/Type/Definition/FieldDefinition.php:90
/home/david/projects/sandbox/graphql-controllers/vendor/webonyx/graphql-php/src/Type/Definition/ObjectType.php:151
/home/david/projects/sandbox/graphql-controllers/vendor/webonyx/graphql-php/src/Utils/TypeInfo.php:180
/home/david/projects/sandbox/graphql-controllers/vendor/webonyx/graphql-php/src/Type/Schema.php:213
/home/david/projects/sandbox/graphql-controllers/vendor/webonyx/graphql-php/src/Type/Schema.php:199
/home/david/projects/sandbox/graphql-controllers/vendor/webonyx/graphql-php/src/Type/SchemaValidationContext.php:244
/home/david/projects/sandbox/graphql-controllers/vendor/webonyx/graphql-php/src/Type/Schema.php:517
/home/david/projects/sandbox/graphql-controllers/vendor/webonyx/graphql-php/src/Type/Schema.php:469
/home/david/projects/sandbox/graphql-controllers/tests/SchemaFactoryTest.php:144
/home/david/projects/sandbox/graphql-controllers/tests/SchemaFactoryTest.php:50

Related to #167