Error dumping big decimal columns

I'm using rails 2.3.5
ruby 1.8.6
mysql Ver 14.12 Distrib 5.0.75, for debian-linux-gnu (i486) using readline 5.2

When I run rake db:schema:dump while I have a column of this format
t.decimal :size, :limit=>63, :precision=>63, :scale=>0
It is dumped to be like this
t.integer "size", :limit => 63, :precision => 63, :scale => 0

This is incorrect because when I load this using rake db:schema:load, it's loaded as
int(11) ############ wrong
instead of
decimal(63,0) ########### correct

To replicate this bug create a new rails application with this migration

class CreateFiles < ActiveRecord::Migration
def self.up

create_table :files do |t|
  t.decimal :size, :limit=>63, :precision=>63, :scale=>0
end

end

def self.down

drop_table :files

end end

then do the following
rake db:drop db:create db:migrate db:schema:dump db:schema:load

correct behavior is
ActiveRecord::Base.connection.columns('files')[1].type == :decimal

incorrect behavior is
ActiveRecord::Base.connection.columns('files')[1].type == :integer

The error is with this method
ActiveRecord::ConnectionAdapters::MysqlColumn#simplified_type
You can find it on active_record/connection_adapters/abstract/schema_definitions.rb: 238

Thanks for your help