Deprecated
(will be removed in 0.212.0) Use https://deno.land/std/http/cookie.ts instead.
import { cookieMapHeadersInitSymbol } from "https://deno.land/std@0.211.0/http/unstable_cookie_map.ts";
Symbol which is used in mergeHeaders to extract a
[string | string][] from an instance to generate the final set of
headers.