On Tuesday, March 27, 2018 at 10:08:18 AM UTC+2, Simon King wrote:
>
> ...since your code is (implicitly!) asking for prime numbers in QQ. 
>
> However, I agree that it is (for most users) unintended behaviour, and 
> as a corollary to "explicit is better than implicit", we have "implicit 
> is not as good as explicit".


There are some design decisions affecting functions. The member function 
is_prime certainly should be specialized. The global function however 
should be helpful and return useful results. Only if the user states 
explcitly (either by using the member function, or giving a 
keyword/argument to global) should there be explicit behaviour. I know this 
crystallized only recently but there we are.

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