code: function (key) {
          let _that = this[PRIVATE];
  
          key = KEYMAP[key.toUpperCase()];
          if (key < _that.pressed.length && key != null) {
              _that.pressed[key] = true;
          }
      }
docs: /*
  Presses a key corresponding with ``Interface.KEYMAP``
  - you can not undo a press. Once a key is pressed it stays pressed until the end of the frame.