Output from API does not match documentation

The documentation, API Definition, and example response clearly state that the mobile coverage indicator should be a letter showing Clear/Red/Amber/Green status When I call the API either from the "Try It" section of the website, or from my own code, it returns an integer in the range of 0 - 4 Given that CRAG evaluates to an array length of 3 as cardinality starts from zero, what does "4" mean in this context?

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