How to lookup a user using API with kid

Is similar to [this issue](https://github.com/keybase/client/issues/24614) but instead of using a PGP prefix is a kid. I need that because [Saltpack](https://saltpack.org/signing-format-v2) do not use a PGP key but a Ed25519 public key. Currently [user/lookup.json](https://keybase.io/docs/api/1.0/call/user/lookup) only support PGP fingerprints and, as shown in the other issue, suffixes, no Ed25519 keys/kids.

From [the source code](https://github.com/keybase/client/blob/38a96307aa34f4ebafff79aa45a7c6245dd2ae38/go/libkb/key_lookup.go#L49-L85) seems there is an undocumented "key/basics.json" endpoint and, unlike the other endpoint, It don't support CORS.

I can workaround the CORS issue by setting up a proxy on my server, but using this undocumented endpoint is fine?

Start by reading go/libkb/key_lookup.go around lines 49-85 and compare the documented user/lookup.json endpoint with the undocumented key/basics.json endpoint. Determine whether KID lookup and CORS support are intended, and establish the supported endpoint and behavior as the outcome.

Written by the indexing model from the issue text.