Deprecated
(will be removed after 0.212.0) Use https://deno.land/std/http/cookie.ts instead.
import { cookieMapHeadersInitSymbol } from "https://deno.land/std@0.212.0/http/cookie_map.ts";
Symbol which is used in mergeHeaders to extract a
[string | string][] from an instance to generate the final set of
headers.