code: function escapeCurly (text, escapes) {
    var newText = text.slice (0, escapes[0]);
    for (var i = 0; i < escapes.length; i += 3) {
      var from = escapes[i];
      var to = escapes[i + 1];
      var type = escapes[i + 2];
      // Which escape do we have here?
      if (type === 0) {   newText += '{{';
      } else {            newText += '}}';
      }
      newText += text.slice (to, escapes[i+3]);
    }
    return newText;
  }
docs: Return a text where all escapes as defined in the toplevel function are indeed escaped.