collin/Gemfile

## boom.rb
require "dm-core"
require "dm-migrations"
DataMapper.setup(:default, "sqlite3://:memory:")
class Foo
  include DataMapper::Resource
  property :id, Serial
  property :bar, Object
end

Foo.auto_migrate!

foo = Foo.new
foo.bar = "HELLO"
foo.save
foo.reload
foo.bar # BOOM

Foo.first # BOOM

## boom2.rb
require "dm-core"
require "dm-migrations"
DataMapper.setup(:default, "sqlite3://:memory:")
class Foo
  include DataMapper::Resource
  property :id, Serial
  property :baz, Object, :default => lambda{|*| Hash.new }, :lazy => false
end

Foo.auto_migrate!

foo = Foo.create
foo.reload
foo.baz # BOOM

## Gemfile
source :gemcutter

git "git://github.com/rails/rails.git"
gem "rake"
gem "jeweler"
gem "shoulda"
gem "activesupport",     "~> 3.0.0.beta1", :require => "active_support"
gem "data_objects",      "~> 0.10.1"
gem "do_sqlite3"
gem "dm-do-adapter",                       :git => "git://github.com/datamapper/dm-do-adapter.git"
gem "dm-sqlite-adapter",                   :git => "git://github.com/datamapper/dm-sqlite-adapter.git"
gem "dm-aggregates",                       :git => "git://github.com/datamapper/dm-aggregates.git"
gem 'dm-migrations',                       :git => 'git://github.com/datamapper/dm-migrations.git'
gem 'dm-timestamps',                       :git => 'git://github.com/datamapper/dm-timestamps.git'
gem 'dm-transactions',                     :git => 'git://github.com/datamapper/dm-transactions.git'
gem 'dm-types',                            :git => 'git://github.com/datamapper/dm-types.git'
gem 'dm-validations',                      :git => 'git://github.com/datamapper/dm-validations.git'
gem 'dm-aggregates',                       :git => 'git://github.com/datamapper/dm-aggregates.git'
gem 'dm-constraints',                      :git => 'git://github.com/datamapper/dm-constraints.git'
gem 'dm-observer',                         :git => 'git://github.com/datamapper/dm-observer.git'
gem "dm-core",                             :git => "git://github.com/datamapper/dm-core.git", :branch => "next"
	require "dm-core"
	require "dm-migrations"
	DataMapper.setup(:default, "sqlite3://:memory:")
	class Foo
	include DataMapper::Resource
	property :id, Serial
	property :bar, Object
	end

	Foo.auto_migrate!

	foo = Foo.new
	foo.bar = "HELLO"
	foo.save
	foo.reload
	foo.bar # BOOM

	Foo.first # BOOM
	source :gemcutter

	git "git://github.com/rails/rails.git"
	gem "rake"
	gem "jeweler"
	gem "shoulda"
	gem "activesupport", "~> 3.0.0.beta1", :require => "active_support"
	gem "data_objects", "~> 0.10.1"
	gem "do_sqlite3"
	gem "dm-do-adapter", :git => "git://github.com/datamapper/dm-do-adapter.git"
	gem "dm-sqlite-adapter", :git => "git://github.com/datamapper/dm-sqlite-adapter.git"
	gem "dm-aggregates", :git => "git://github.com/datamapper/dm-aggregates.git"
	gem 'dm-migrations', :git => 'git://github.com/datamapper/dm-migrations.git'
	gem 'dm-timestamps', :git => 'git://github.com/datamapper/dm-timestamps.git'
	gem 'dm-transactions', :git => 'git://github.com/datamapper/dm-transactions.git'
	gem 'dm-types', :git => 'git://github.com/datamapper/dm-types.git'
	gem 'dm-validations', :git => 'git://github.com/datamapper/dm-validations.git'
	gem 'dm-aggregates', :git => 'git://github.com/datamapper/dm-aggregates.git'
	gem 'dm-constraints', :git => 'git://github.com/datamapper/dm-constraints.git'
	gem 'dm-observer', :git => 'git://github.com/datamapper/dm-observer.git'
	gem "dm-core", :git => "git://github.com/datamapper/dm-core.git", :branch => "next"