The error response telling me to upgrade to a paid plan isn't in json.

Also, I broke something, maybe in the caching logic. I tried 99999999 then 999999 then 99999 and down, and now I'm currently getting.

    ~$ curl https://api.isfizzbuzz.xyz/api/9
    Invalid number. Please upgrade to a paid plan to use imaginary, non-real, or non-numeric numbers.

also fails on 8.