eliminate the result accumulator setup outside the reduce

[baob]

I'm not sure if I like the change now I've done it. However I was motivated to eliminate the setup outside the reduce.

I kind of like the symmetry of having that array passed in to the reduce, that has a slowly building first part (roman numeral) and a slowly diminishing second part (number to be converted -> remainder).

I like the fewer lines.

I dislike that it's less readable.

[baob]

Great article, BTW. Set me thinking, as usual.