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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.
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The golden ratio is transcendental? The golden ratio is (1+sqrt(5))/2
Added a bit to the description, thanks for the feedback!
The golden ratio is irrational and transcendental, it cannot be expressed in either decimal or binary float. This task needs a more explicit description of required precision to be well-specified.
This passes your tests, but does not pass your description:
Anything that is not a string is not an isogram (ints, nils, etc.)This code gives: