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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.
No. Ruby is an anarchist pirate ship captained by cats. Everything happens at some point or another.
But regardless, that's not a central tenant to my knowledge and it is done in several prominent projects including Rails.
Katas should be approachable from many angles. This is much too specific. Oxin's preference is much better. I can think of many ways to make parts of MrFreeze non-modifiable, but I can only think of one way to freeze it.