Pre-PEP: __hashable__

[Delaney, Timothy]

> From: Chad Netzer [mailto:cnetzer at mail.arc.nasa.gov]
> 
> Yeah, I'm not decided for the __hashable__() idea, although I would 
> be willing to think about it if a PEP was made.

That's the whole idea of this pre-PEP - to determine if it's worthwhile
making a PEP (even if the aim is to get it rejected) and to see what ideas,
comments people come up with so they can be stated in the PEP.

Tim Delaney