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[Python-Dev] Is static typing still optional?

On 01/28/2018 07:45 AM, Eric V. Smith wrote:
> On 1/6/2018 5:13 PM, Eric V. Smith wrote:
>> On 12/10/2017 5:00 PM, Raymond Hettinger wrote:

>>> 2) Change the default value for "hash" from "None" to "False".  This might take a little effort because there is
>>> currently an oddity where setting hash=False causes it to be hashable.  I'm pretty sure this wasn't intended ;-)
>> I haven't looked at this yet.
> I think the hashing logic explained in https://bugs.python.org/issue32513#msg310830 is correct. It uses hash=None as the
> default, so that frozen=True objects are hashable

In a class, `__hash__ = None` means the instances are not hashable... but in a dataclass decorator, `hash=None` means 
they are?