[plt-scheme] string->number

Hello all:

Another Rip-van-Winklish question as I work my way through my old code.
Did string->number change its definition sometime in the last few years?
I have old code that seems to depend on this:

  (string->number " 0000")  => 0

But what that gets is:

  (string->number " 0000")  => #f

it's possible that the other end changed here (the device that delivers
the " 0000"), so I'm curious to know if there was a change on the scheme
side.  Any ideas?

Many thanks,

 -tom

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