A module that helps encapsulate option and configuration data using a
-multi-layer stacking model.
+multi-layer stacking model.
Classes, for example, set default values for all
instances. Instances can set new values. If an instance doesn't set a value, the
Python's ``*args`` variable-number of arguments and ``**kwargs`` keyword
arguments are sometimes called "magic" arguments. ``options`` takes this up
-a notch, allowing arguments to be interpreted on the fly. This is useful, for instance,
+a notch, allowing setters much like Python's ``property`` function or ``@property``
+decorator, in turn allowing arguments to be interpreted on the fly. This is useful, for instance,
to provide relative rather than just absolute values. As an example, say that