Add PyNone to represent Python None #253
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Add a new zero-sized struct `PyNone`, that represents Python's `None`. This is similar to `NoArgs` for the empty tuple, and is useful for defining functions or methods that return None in Python.
Rather than contructing `py.None()` just to compare against (which increments and then decrements the refcount on `None`), add a method on `PyObject` that tests whether the object is the `None` instance. Use this more widely to reduce the number of `unsafe` blocks.
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Add a new zero-sized struct
PyNone, that represents Python'sNone. This issimilar to
NoArgsfor the empty tuple, and is useful for defining functionsor methods that return None in Python.