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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.
It's an approximation. e+16 means 16 digits, which is about as much as floats can handle. For bigger numbers, you will be losing precision.
Open up a REPL, and try something like 2 == 2.000000001. They are not the same.
Take the hint... don't use floats at all!
That means you are using float division somewhere, instead of integer division.
You are returning arrays with some leading zeros, you need to remove them. The first array is your returned array, the 2nd is expected one. You could print the input to console to see which test fails, and where.
For more general tips, see: https://docs.codewars.com/training/troubleshooting