On Friday, February 5, 2016 at 10:23:17 AM UTC-8, Nathann Cohen wrote:
>
> > I suppose you meant to add a third rule 
> >     3) In any branch where a **kwargs -taking function does not call 
> another 
> > function it forwards the **kwargs argument to, it must raise an error if 
> any 
> > unrecognized kwargs are left. 
>
> I thought about it for a moment, and wondered if there was any 
> situation were using **kwargs was the right tool in a function that 
> did not forward its input to anything. I couldn't find any


Well, the call syntax for polynomials and symbolic expressions really 
benefits from arbitrary keywords. 

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