Making Collision Layers more readable in code | CODE

func layerNum(_layerValue : int) -> int:
    var _layerNum : int
    var LV_expBase2 : int = 0
    while _layerValue != 2:
        var  opResidue = _layerValue % 2
        assert(opResidue == 0, "Layer Number Invalid")
        @warning_ignore("integer_division")
        _layerValue = _layerValue / 2
        LV_expBase2 += 1
    _layerNum = 2 + LV_expBase2
    return _layerNum

func layerValue(_layerNum : int) -> int:
    var _layerValue : int
    _layerValue = 2 ** ( _layerNum - 1 )
    return _layerValue