Re: tonumber() on negative hexadecimal strings

[Shmuel Zeigerman <shmuz@...>]

On 19/04/2011 20:22, Roberto Ierusalimschy wrote:
> > I forgot about this one. There must be a reason for that, as it
> > seems as an unnecessary limitation? (I was just bitten by that in my
> > app).
>
> It was caused by the use of strtou. (With strtol, we would have problems
> with values greater than 2^31.) But in fact there is a bug there. If
> the string is not a valid number, 'tonumber' should return nil. Unlike
> some other functions, 'tonumber' should work with any argument.

So, tonumber("-0x10") should return nil ?

Just spotted another issue (could be a documentation issue): docs say 
that the default for `base' is 10, but in fact, if the first argument 
starts with 0x then the default is 16.

> =tonumber("0x10")
16
> =tonumber("0x10", 10)
16
> =tonumber("0x10", 16)
16
> =tonumber("0x10", 3)
nil

--
Shmuel