This a minimal sparse vector implementation that I needed for Lunrelm.
It maybe of value to others so I split it out.
Its functionally may increase over time as needed.
You are welcome to contribute additional functionality, it is highly desirable to have at least a test for new functions.
Using elm-format now.
This uses elm-test for testing so install it if you dont have it.
To run Tests
Copyright (c) 2015 Robin Luiten