.. class:: Integral
- Subtypes :class:`Rational` and adds a conversion to :class:`int`.
- Provides defaults for :func:`float`, :attr:`~Rational.numerator`, and
- :attr:`~Rational.denominator`, and bit-string operations: ``<<``,
- ``>>``, ``&``, ``^``, ``|``, ``~``.
+ Subtypes :class:`Rational` and adds a conversion to :class:`int`. Provides
+ defaults for :func:`float`, :attr:`~Rational.numerator`, and
+ :attr:`~Rational.denominator`. Adds abstract methods for ``**`` and
+ bit-string operations: ``<<``, ``>>``, ``&``, ``^``, ``|``, ``~``.
Notes for type implementors