[racket] string->number failure value

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Hi Carl,

On 08/16/11 15:45, Carl Eastlund wrote:
> Writing (or (string->number str) default) has the same effect, since 
> #f never indicates a success.  The same is not true of hash-ref,
> where #f can be a value in the hash table; that's why it needs an
> explicit default argument.

That is a good point, thanks.

Marijn
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