[Issue 6718] "nWayUnion" => "nWayMerge", plus true nWayUnion

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=6718

--- Comment #13 from RazvanN <razvan.nitu1305 at gmail.com> ---
(In reply to Andrei Alexandrescu from comment #11)
> >Maybe we should also rename setIntersection to multiwayIntersection
> 
> setIntersection has two inputs. "multiwayIntersection" would have multiple
> inputs (a range of ranges) and would be a distinct function with important
> uses and its own theory and practice
> (http://www.cs.toronto.edu/~tl/papers/wea06.pdf is a good overview).

Actually, looking at the implementation, it seems that setIntersection also has
a variable number of inputs :
https://dlang.org/phobos/std_algorithm_setops.html#setIntersection

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