The trapdoor has three logical states. #36
Merged
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We have added a logical "invisible" state to the trapdoor. All of
our objects are already allowed to be invisible, but they tend to
be things that can't be interacted with, or fake-invisible so that
you can access them if you know about them.
The trapdoor must be really invisible though, so it can only be
opened/closed once discovered.
Add the third state, and use it appropriately. This closes #33.