Shift-JIS encoded strings and YAML.load bug

Hello,

Some of my colleagues discovered a problem loading YAML with
Shift-JIS strings when the Ruby's $KCODE is set to Shift-JIS mode.  It
appears that certain escape sequences are being stripped out of the
string when YAML.load is called.  This means that the resulting string
will not display properly.  This happens with both Ruby 1.8.1 and
1.8.2 installs in x86 linux environments.

Below is example code showing the problem, assuming my mailer does not
kill the characters.  You need to run this with a terminal that
outputs Shift-JIS.

ruby -KS sjis_yaml.rb
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require 'yaml'

str1 = "表"
str2 = "表表"

puts "str1: #{str1}"
puts "str2: #{str2}"

puts "---"
puts "str1 yaml: #{str1.to_yaml}"
puts "str2 yaml: #{str2.to_yaml}"

puts "---"
puts "str1 reloaded: #{YAML::load(str1.to_yaml)}"
puts "str2 reloaded: #{YAML::load(str2.to_yaml)}"

$KCODE=""
puts "---"
puts "Removed KCODE setting"
puts "str1 reloaded: #{YAML::load(str1.to_yaml)}"
puts "str2 reloaded: #{YAML::load(str2.to_yaml)}"

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BTW,  I am not sure if I should add this as a bug report to the Ruby
bug tracker or the Syck bug tracker on Rubyforge.  Any guidance on
where this should go is appreciated.  I will then add this bug report
to the proper tracker with the code as an attachment.

Thanks,
Zev Blut