Improving std.range.Zip

[bearophile]

Simen kjaeraas:

>  From what I can see, map currently simply doesn't support passing it
> multiple ranges. It would be a trivial change to let it support multiple
> ranges in addition to multiple functions.

If you may have multiple of both then the situation becomes complex. So I think that single function - multiple ranges is simpler & better than that :-)

Bye,
bearophile