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Unknown Sender
July 28, 2005 23:36
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I see three problems with this function:

1. [#36674] -undef results in -0.0 rather than the expected 0.
This is probably easy to fix, but I don't know if undef is the only value for which (!SvIOKp(sv) && !SvNOKp(sv) && !SvPOKp(sv)).

2. [#36675] Strings starting with '-' or '+' are treaded as strings, even when they represent numbers. Now I doubt this should be changed, but at least it should be clearly documented in perlop and probably perltrap. (imagine someone extracts numbers with a regular expression or split, and expects "-100" to be treated the same way as "100")

3. There is some special treating of UTF-8 strings: they can be prefixed with '-' even when they don't start with an "identifier first" character.
I was unable to provoke this behavior in practice, who knows how to do that?

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