AR::Migrations not quoting index names?

Rails 2.3.2 gem

PostgreSQL 8.3.7

Situation:

Given a migration containing an index name with mixed case f.e. (idxU_name)

And given the DB adapter is postgresql

When rake db:migrate is run

Then the index idxU_name is created

When rake db:migrate VERSION=0 is run

Then the mirgration attempts to remove an index named idxu_name, which fails.

#db/migrate/x_create_sessions.rb
  def self.up
    ...
    add_index     :sessions, :updated_at,   
                    :name   => :idxR_sessions_updated_at,
                    :unique => false
  end

  def self.down
    remove_index  :sessions,  :name   => :idxR_sessions_updated_at
...
# rake db:migrate VERSION=0

==  CreateSessions: reverting =================================================
-- remove_index(:sessions, {:name=>:idxR_sessions_updated_at})
rake aborted!
An error has occurred, this and all later migrations canceled:

PGError: ERROR:  index "idxr_sessions_updated_at" does not exist
: DROP INDEX idxR_sessions_updated_at

Note the lack of quotes around the DROP argument. PostgreSQl will lowercase all arguments unless they are enclosed in quotes.