Decimal handling for currency (precision)

[aberba]

Some suggest working with the lowest currency denomination to 
avoid decimal precision handling and only convert to the highest 
denominations (decimal) when displaying. I've also seen some use 
decimal value handling libraries.

I'm thinking lowest denominations will result in extremely large 
values that D's type system cannot store (if such large values 
makes sense or can happen with money in real life).

What will be your advise on the type to use by default, the 
currency denominations (100p instead of 1.0 dollars), and cost of 
computation.