Why doesn't this work?

x = zoo(1:5, as.Date('2001-01-01')+1:5)
x[as.Date('2001-01-05')]
x[as.Date('2001-01-05')] = 0
x


I think this is especially bad because it doesn't cause an error.  It lets
you do something to x, but then you can't see x again to see what it did.

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