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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
There is a difference between "each handler will be subscribed at most once at any given moment" and "each handler will subscribe at most once".
It seems you are reading the second meaning into the first wording.
If you subscribe the same function twice, it should then be subscribed once.
If anybody has a suggestion for a clearer description, please raise that. Closing this issue.
fixed
Fixed.