Koa v4 Tracker

New tracker for v4 as I plan to launch v3 soon:

Breaking Changes:

• adjust naming to WHATWG standards https://nodejs.org/api/url.html#url_url_strings_and_url_objects
• rename raw http requests? https://github.com/koajs/koa/issues/1114#issuecomment-405937240

Refactor & Rewrite:

• Rewrite in TypeScript https://github.com/koajs/koa/issues/1607
  • Need to rewrite all submodules in TypeScript first!
• Update node.js modules (e.g. node:assert, etc.)

Platform Support:

• Deno support
• Bun support
• HTTP2 support https://github.com/koajs/koa/issues/1736

Features:

• Improved stream support https://github.com/koajs/koa/issues/1864 https://github.com/koajs/koa/issues/1834
• Improved forwarded headers support https://github.com/koajs/koa/issues/1746 https://github.com/koajs/koa/issues/827 https://github.com/koajs/koa/issues/281
• https://github.com/koajs/koa/issues/1707

Improved Documentation:

• example of how to use expect-continue
• https://github.com/koajs/koa/discussions/1827