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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.
Using Math/PI fails with
(tank-vol 7 7 3848)
=> 3847.9999999999995
Looks like most favoured solutions don't bring bonus points.
I'd say this one is one is the best solution. Simple, short and clear. No unnecessary meta stuff.
For VALUES in this case it is possible to use value index as a value - VALUES = [:zero, :one, :two, :three.... VALUES.index(x)