Loops versus ranges

[bearophile via Digitalmars-d-learn]

anon:

> Changed to
>     return data.map!(n => foo2(data, i + 1, 
> max)).cache.joiner.array;
> then it produced the same result as array version. 
> `map.cache.join` resulted in 597871.

This is close to tell what the cause is :-)

Bye,
bearophile