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w_nightshade said: Obviously, this is all just my ignorant opinion. So here goes:
The date system seems more cumbersome to me. The cons you listed are significant, and I find the range issue especially problematic. My guts tell me "no."
Decimals seem cleaner to me, and the expandability is very useful. And the example of Frederico's novel (when can I pre-order?) sounds perfectly workable to me as stated - I don't have a problem with it. And it has the added benefit of being (relatively) easy to script for when working with this stuff in a database (for example). Decimal system gets my vote.