* - 'legacy-name' (optional): short name for backwards-compatibility
* @param array $checked Array of checkbox name (matching the 'legacy-name') => bool,
* where bool indicates the checked status of the checkbox
* - 'legacy-name' (optional): short name for backwards-compatibility
* @param array $checked Array of checkbox name (matching the 'legacy-name') => bool,
* where bool indicates the checked status of the checkbox