@adobe/htlengine 6.x - variables are converted to lowercase and break about htlengine HOT 4 CLOSED

let headlineDemo;
  headlineDemo = function* _template_global_headlineDemo(args) { 
    const textMessage = args[1]['textMessage'] || '';
    let $t, $n = args[0];
    $.dom.text($n,"\n  ");
    $t = $.dom.create("h1",false,false);
    $n = $.dom.push($n,$t);
    const var_0 = yield $.xss(textMessage, "html");
    $.dom.append($n, var_0);
    $.dom.text($n,"!");
    $n = $.dom.pop($n);
    $.dom.text($n,"\n");
  };
  $.template('global', 'headlineDemo', headlineDemo);