isBoth
import { isBoth } from "https://github.gh-proxy.cn/raw.githubusercontent.com/baetheus/fun/main/these.ts";Check if a These is a Both (partial success).
@example
import { isBoth, left, right, both } from "./these.ts";
console.log(isBoth(left("Error"))); // false
console.log(isBoth(right(42))); // false
console.log(isBoth(both("Warning", 42))); // true