From: Marcus Rueckert <darix@...>
Date: 2010-10-30T23:14:53+09:00
Subject: [ruby-core:32975] Re: [Ruby 1.9-Bug#4005] YAML fails to roundtrip Time objects

On 2010-10-30 23:07:52 +0900, Aaron Patterson wrote:
> I'm not able to reproduce this with Syck.  Can you try with Psych
> instead?  Like this:
> 
>   ruby -v -ryaml -e 'YAML::ENGINE.yamler = "psych"; t0 = Time.now; p t0; p YAML::load(YAML::dump(t0)) == t0'
> 
> I suspect your error is due to fractional second support.  Observe the
> output of Syck compared to Psych:
> 
>   ### Using Syck
>   $ ruby -v -ryaml -e 't0 = Time.now; p t0; p YAML::dump(t0)'
> 
>   "--- 2010-10-30 07:05:46.535362 -07:00\n"
> 
>   ### Using Psych
>   ruby -v -ryaml -e 'YAML::ENGINE.yamler = "psych"; t0 = Time.now; p t0; p YAML::dump(t0)'
> 
>   "--- 2010-10-30 07:06:48.118999000 -07:00\n...\n"

$ ruby1.9 -v -ryaml -e 'YAML::ENGINE.yamler = "psych"; t0 = Time.now; p t0; p YAML::load(YAML::dump(t0)) == t0'
ruby 1.9.2p0 (2010-08-18 revision 29036) [x86_64-linux]
/usr/lib64/ruby/1.9.1/psych/deprecated.rb:79: warning: method redefined; discarding old to_yaml_properties
/usr/lib64/ruby/1.9.1/syck/rubytypes.rb:13: warning: previous definition of to_yaml_properties was here
2010-10-30 16:11:41 +0200
true

$ ruby1.9 -v -ryaml -e 't0 = Time.now; p t0; p YAML::load(YAML::dump(t0)) == t0'
ruby 1.9.2p0 (2010-08-18 revision 29036) [x86_64-linux]
2010-10-30 16:11:50 +0200
false

$ ruby1.9 -v -ryaml -e 'YAML::ENGINE.yamler = "psych"; t0 = Time.now; p t0; p YAML::dump(t0)'
ruby 1.9.2p0 (2010-08-18 revision 29036) [x86_64-linux]
/usr/lib64/ruby/1.9.1/psych/deprecated.rb:79: warning: method redefined; discarding old to_yaml_properties
/usr/lib64/ruby/1.9.1/syck/rubytypes.rb:13: warning: previous definition of to_yaml_properties was here
2010-10-30 16:12:39 +0200
"--- 2010-10-30 16:12:39.608620883 +02:00\n...\n"

$ ruby1.9 -v -ryaml -e 't0 = Time.now; p t0; p YAML::dump(t0)'
ruby 1.9.2p0 (2010-08-18 revision 29036) [x86_64-linux]
2010-10-30 16:12:52 +0200
"--- 2010-10-30 16:12:52.775869 +02:00\n"

why does psych add the "...\n"?

hth

    darix

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