elbywan/wretch 2.7.1

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const headers1 = new Headers({ "hello": "world" });
const headers2 = new Headers({ "bonjour": "le monde" });
const headers3 = { "hola": "mundo " };
const headers4 = [["hallo", "welt"]]

let w = wretch().headers(headers1);
console.log(w._options.headers);
// Object { hello: "world" }
w = w.headers(headers2);
console.log(w._options.headers);
// Object { hello: "world", bonjour: "le monde" }
w = w.headers(headers3);
console.log(w._options.headers);
// Object { hello: "world", bonjour: "le monde", hola: "mundo " }
w = w.headers(headers4);
console.log(w._options.headers);
// Object { hello: "world", bonjour: "le monde", hola: "mundo ", hallo: "welt" }