Method constructor

github-actions/saucelabs/set-saucelabs-env.js:12274–12285

(init)

            const header = object[i];
            if (header.length !== 2) {
              throw webidl.errors.exception({
                header: "Headers constructor",
                message: `expected name/value pair to be length 2, found ${header.length}.`
              });
            }
            appendHeader(headers, header[0], header[1]);
          }
        } else if (typeof object === "object" && object !== null) {
          const keys = Object.keys(object);
          for (let i = 0; i < keys.length; ++i) {
            appendHeader(headers, keys[i], object[keys[i]]);
          }
        } else {
          throw webidl.errors.conversionFailed({
            prefix: "Headers constructor",