units should give up on exchange rates
units(1) currently has exchange rates for several currencies, last updated in 2002 for those pinned to the euro (which might be fine), and probably in 1998 and no later than 2005 for the others.
20 year old exchange rates are worse than useless, and given the fluctuations of any non-fixed exchange probably useless in general. We should remove them (or in the very worse case fix them)
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