decimal or integer columns are returned as strings

Hello!

Well as the title states, I'm having problem with this, since in my migration table I have:

$table->decimal('price');
$table->integer('users');
$table->integer('storage');

The returned response looks like this:

[{"animals":"5","created_at":"2018-02-20 17:54:25","emails":"92","period":"8","price":"9","sms":"72","storage":"1430""users":"6"}].

I don't know what I'm doing wrong, if I set any of the into the casts property of the model, it works, but I think it should work without casting them... doesn't it?