From: yermej <yermej@...>
Date: 2010-10-20T13:10:13+09:00
Subject: Re: YAML serialization of Hash with Set key not loadable

On Oct 19, 1:27 pm, Tim Garnett <tgarn...@panjiva.com> wrote:
> YAML serialization seems to be failing for me with any structure that
> involves a hash with a set key. Is there documentation anywhere on what
> sorts of objects are able to be serialized/deserialized via YAML? Or if
> this is a bug that's fixed in a newer ruby version (I'm using
> 1.9.1p378)?

I'm seeing the same behavior in 1.8.6p399 and 1.9.2rc2 so it's
probably a bug that's been around for a while.

I don't know the reason for the issue since it seems to be somewhere
in the Syck library. In any Ruby I've tested:

ruby-1.9.2-rc2 > puts YAML.dump({[1].to_set=>1})
---
!ruby/object:Set ?
  hash:
    1: true
: 1

 => nil

while the correct YAML is:

---
?
  !ruby/object:Set
    hash:
      1: true
: 1

I guess that means it's a Syck bug, but this is all from a quick look
so I'm not sure.

Jeremy