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I agree that bc.number does that for decimals. 
But, my hex values can't probably fit 32 bits.
Those hex values represent urls as returned by :

function url2hex(url) 
h,s =  string.gsub(url, "(.)", function(c) return string.format("%02x", string.byte(c)) end) 
return h

I can't find any other workaround than looking into Luiz's bc library sources to see how it works and if it's easy to extend it.
Or how to transate a BigInt value into a bc's compatible big integer. Suggestions ? 

On Tue, Mar 16, 2010 at 1:02 PM, Luiz Henrique de Figueiredo <> wrote:
 > bigint_hextonum, but what
> I probably need is a way to translate a string  to a bc's big-integer.

bc.number does that for decimal numbers: