Result summary:
== 0.4.dev-20120122-1 returns all bad for non-existent world
== 0.4.dev-20120122-1 returns all good for self-generated world
== 0.4.dev-20120408 returns all bad for non-existent world
== 0.4.dev-20120408 returns all good for self-generated world
== 0.4.dev-20120408 returns all good for world generated by 0.4.dev-20120122-1
== 0.4.dev-20120606 returns all bad for non-existent world
== 0.4.dev-20120606 returns all good for self-generated world
== 0.4.dev-20120606 returns all good for world generated by 0.4.dev-20120122-1
== 0.4.dev-20120606 returns all good for world generated by 0.4.dev-20120408
== 0.4.1 returns all bad for non-existent world
== 0.4.1 returns all good for self-generated world
== 0.4.1 returns all good for world generated by 0.4.dev-20120122-1
== 0.4.1 returns all good for world generated by 0.4.dev-20120408
== 0.4.1 returns all good for world generated by 0.4.dev-20120606