Migrate d3js to v4 and correct d3js visualisations i.e. bug 3.20. Breadcrumb navigation for the language treemap has been improved
<?php
namespace CorpusParole\Models;
use Illuminate\Database\Eloquent\Model;
class GeonamesHierarchy extends Model
{
/**
* The attributes that should be casted to native types.
*
* @var array
*/
protected $casts = [
'hierarchy' => 'array',
];
}