Magento 2.3.0 has stopped to convert `_` to `-` in `<body>` css classes

News
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Magento 2.3.0

https://github.com/magento/magento2/blob/2.3.0/lib/internal/Magento/Framework/View/Page/Config.php#L532-L532

Magento 2.2.8

https://github.com/magento/magento2/blob/2.2.8/lib/internal/Magento/Framework/View/Page/Config.php#L501-L501