code: func ModGet(xu *xgbutil.XUtil, keycode xproto.Keycode) uint16 {
  	modMap := ModMapGet(xu)
  
  	var i byte
  	for i = 0; int(i) < len(modMap.Keycodes); i++ {
  		if modMap.Keycodes[i] == keycode {
  			return Modifiers[i/modMap.KeycodesPerModifier]
  		}
  	}
  	return 0
  }
docs: // ModGet finds the modifier currently associated with a given keycode.
  // If a modifier doesn't exist for this keycode, then 0 is returned.