Rails - May 2008 - how to get the data type of a variable?

Hi all:

I''m importing a csv file which I need to check if a particular column
is
a valid dollar amount (doest need to have the $ sign)

What I have is
if parsed[column5].class.to_s = Float

But this class method is actually giving me "CSV::Cell"

Would anyone be able to give me a hand on this?

Thanks

grace
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