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Please ignore the deletion of the package-lock, and the addition of .gitignore ... these are because the original repo only had a .hgignore (which my git ignored)
The change to story.js adds two more lifecycle events.
The purpose of these events is to enable you to save the state exactly as it was when the last passage transition happened (before that passage modifies state), and to be able to restore that state on refresh, if you wish.