How is trailingSlash 'never' supposed to work on Vercel when static prerendered?

[alexbjorlig]

I'm trying to understand the documentation here.

If we have a route /docs/ deployed with static pre-render on Vercel, should it not redirect to /docs?

My coworker insists that we should update a property in vercel.json - but should it nok work without updating the vercel.json file?

[eltigerchino]

If you’re using adapter-vercel, I think Kit writes a static redirects file for you.

EDIT: same thing happens for adapter static

kit/packages/adapter-vercel/index.js

Line 372 in 799b9e7

function static_vercel_config(builder) {

It writes to a config.json file
https://vercel.com/docs/build-output-api/v3/configuration#routes