Issue #3039730 by ndobromirov, Wim Leers, e0ipso, l0ke, webchick, xjm: Include...

    $exploded_paths = array_map(function ($include_path) {

      return array_map('trim', explode('.', $include_path));

    }, $include_paths);

    $resolved_paths = [];

    $resolved_paths_per_resource_type = [];

    /* @var \Drupal\jsonapi\JsonApiResource\ResourceIdentifierInterface $resource_object */

    foreach ($data as $resource_object) {

      $resolved_paths = array_merge($resolved_paths, static::resolveInternalIncludePaths($resource_object->getResourceType(), $exploded_paths));

      $resource_type = $resource_object->getResourceType();

      $resource_type_name = $resource_type->getTypeName();

      if (isset($resolved_paths_per_resource_type[$resource_type_name])) {

        continue;

      }

      $resolved_paths_per_resource_type[$resource_type_name] = static::resolveInternalIncludePaths($resource_type, $exploded_paths);

    }

    $resolved_paths = array_reduce($resolved_paths_per_resource_type, 'array_merge', []);

    return static::buildTree($resolved_paths);

  }