> To improve readability, could you define a ‘pre-release?’ procedure so
> we can write:
>
>   let ((releases (match (remove pre-release? json)
>                    (() json)  ;keep everything
>                    (releases releases))))

I have made this change. In addition, I have also made another patch
improving the readability of the function by using any and cond. Please
find both patches attached.