Encoding::UTF_8 missing?

Encoding shows up in Ruby 1.9 as part of the multibyte change made to
String. That said, Rails 2.3.4 does make reference to Encoding::UTF_8
but those references are conditional. If you look at
"activesupport-2.3.4/lib/active_support/core_ext/string/multibyte.rb"
you'll see the gory details.

I can run db:seed with Ruby1.8.7/Rails2.3.4 with no problem.
ruby --version =>
   ruby 1.8.7 (2009-06-08 patchlevel 173) [powerpc-darwin9.7.0]
rails --version => Rails 2.3.4
gem list mysql => mysql (2.8.1)
mysql --version =>
  mysql Ver 14.14 Distrib 5.1.39, for apple-darwin9.5.0 (powerpc)
using readline 5.1

database.yml:

development:
  adapter: mysql
  encoding: utf8
  reconnect: false
  socket: /tmp/mysql.sock
  database: auth-1.8_dev
  pool: 5
  username: ****
  password: ********

seeds.rb

Page.create(:title => "It's all about the pie...",
                     :body => "Welcome to Journeys")