def __contains__(self, val):
conv = self.__val_convert(val) <EOL>return self.contains(val) == conv[<NUM_LIT:1>] - conv[<NUM_LIT:0>]<EOL>
Method which allows ``in`` operator usage.

Parameters
----------
val : int or tuple or list or range
    Range or integer being checked.

Returns
-------
bool
    ``True`` if **whole** examined range is present in object. Otherwise ``False``.