Pretty please: Named arguments

[Bekenn]

On 2/27/2011 11:32 PM, Russel Winder wrote:
> The Python mechanism relies on the fact that despatch is by name and not
> by signature.  Languages that dispatch by signature will have
> significantly greater problems!
>

I don't follow; the compiler has to look up the correct function 
signature whether you use named arguments or not.  How is this 
significantly different?