Re: YAML 1.2 Draft 2008-05-11

On 11/05/08 20:39 -0400, Ricardo SIGNES wrote:
> * Oren Ben-Kiki <[email protected]> [2008-05-11T19:09:24]
> > We have an *open issue* with regard to null values (in the "Core" schema).
> > - Should we still allow the '~' value to stand for a null?
> > (Currently the spec says yes, but we want to know if people are using
> > it in practice).
> 
> Gosh, yes.  I can't say how often we're using it offhand, but I think it's
> pretty darn common in the Perl universe.  I don't know that anyone uses null.
> 
>   DB<5> x YAML::Load("---\nfoo: ~\n")
>   0  HASH(0xa2b170)
>      'foo' => undef
>   DB<6> x YAML::Load("---\nfoo: null\n")
>   0  HASH(0xa32ca0)
>      'foo' => 'null'
> 
>   DB<2> x YAML::Syck::Load("---\nfoo: ~\n")
>   0  HASH(0x908cc0)
>      'foo' => undef
>   DB<3> x YAML::Syck::Load("---\nfoo: null\n")
>   0  HASH(0x80ee90)
>      'foo' => 'null'
> 
> In other words, the two popular libraries for YAML in Perl both recognize ~ and
> not null.  The Perl bindings for libyaml are not documented, not widely used,
> and the last I saw had at least one or two obnoxious bugs.  In Perl, people are
> using YAML::Syck and YAML.  (Well, and YAML::Tiny, which is a lousy subset of
> YAML.)

Don't forget YAML::XS. This is actually the most correct Perl implementation
since it is a binding of the nearly perfect libyaml library.

Cheers, Ingy

> 
> Eliminating ~ would be a disaster.
> 
> -- 
> rjbs
> 
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