Function typing

example/tests/gm_xhr_test.js:65–74

(x)

  // value type helper
  const typing = (x) => {
    let t = x === null ? "null" : typeof x;
    if (!x) t = `<${t}>`;
    if (t === "object") {
      try {
        return x[Symbol.toStringTag] || "object";
      } catch (e) {}
    }
    return t;
  };

  const statusCode = (response) => {
    return (+response.readyState + +response.status / 1000).toFixed(3);