Redirect in action does not respect status code

[coryvirok]

Describe the bug

If a form action redirects, the status code passed into redirect(status, location) is always replaced with 303.

Reproduction

https://stackblitz.com/edit/sveltejs-kit-template-default-cq96ae?file=src/routes/+page.server.js

Click the button and look at the console logs. You'll see a 303 redirect even though we passed in "302".

Logs

Status code: 200
Status code: 303
Status code: 200

System Info

System:
    OS: macOS 13.0.1
    CPU: (10) arm64 Apple M1 Pro
    Memory: 62.42 MB / 32.00 GB
    Shell: 5.8.1 - /bin/zsh
  Binaries:
    Node: 18.9.0 - /opt/homebrew/bin/node
    Yarn: 1.22.19 - ~/.yarn/bin/yarn
    npm: 9.1.3 - /opt/homebrew/bin/npm
  Browsers:
    Chrome: 108.0.5359.124
    Safari: 16.1
  npmPackages:
    @sveltejs/adapter-auto: ^1.0.0 => 1.0.0
    @sveltejs/kit: ^1.0.0 => 1.0.1
    svelte: ^3.54.0 => 3.55.0
    vite: ^4.0.0 => 4.0.1

Severity

serious, but I can work around it

Additional Information

I'm guessing this isn't a big deal for most of the client rendered apps out there. But if there are any server rendered apps that rely on non-303 redirects from a form action, e.g. a Permanent redirect, this will be important.