[racket] string->number failure value

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Hi,

Upon failure to recognize a number string->number currently returns #f.
It would be nice if it was possible to supply the failure value as an
argument, the way it is possible for hash-ref. Problem with that is that
string->number currently takes an optional argument to determine the
radix in which the string should be interpreted as a number. If both
optional arguments were promoted to keyword arguments then there would
be no ordering problem. So I'd like to propose to change the signature
of string->number to:

(string->number string #:radix [radix 10] #:default [default #f])

What do you think?

Marijn
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