import { type EveryIsSet } from "https://deno.land/x/deepmergets@v4.3.0/dist/deno/types/utils.ts";
Returns whether or not all the given types are sets.
Note: This may also return true if all are maps.
definition: Ts extends Readonly<readonly [infer T1]> ? IsSet<T1> : Ts extends readonly [infer Head, ...infer Rest] ? IsSet<Head> extends true ? Rest extends readonly [unknown, ...ReadonlyArray<unknown>] ? EveryIsSet<Rest> : false : false : false