Express Checkout API: Fractional amounts

[Blueice]

Does the PayPal ExpressCheckout API now support fractional amounts.

This is important when products are ordered that can be bought in custom amounts/lengths (e.g. 0.5m of cloth).

When the PayPal API doesn't support it, what can be done as workaround?

Make the fractional amount a whole amount and compensate the price for that amount? (e.g. 0.5 for 0.5m to 1 for 1m, with the price halved?) - 

or just leave these order items out completely?