I know this switch happened a long time ago but it's come up as a compatibility question with uvdsl/solid-oidc-client-browser#14

The OIDC Discovery Spec says

id_token_signing_alg_values_supported
REQUIRED. JSON array containing a list of the JWS signing algorithms (alg values) supported by the OP for the ID Token to encode the Claims in a JWT [JWT]. The algorithm RS256 MUST be included. ...

My understanding is that of V3, CSS only supports ES256.

The Solid-OIDC spec depends on parts of the OIDC Discovery Spec but not necessarily this part.

From what I can piece together

• V3 made the change and it was discussed on gitter somewhere https://solid.github.io/solid-oidc-tests/ #1181 (comment)
• The relevant commit doesn't seem to provide an explanation as it's mostly related to switching to V7 of node-oidc-provider c9ed90a#diff-d95fb8bd621a3d884290b9b516068821fbb2c4fb7fa9eebb899a59558ee9702d

Does anybody have a recollection of what the conversation on gitter was and why rs256 support was dropped?

Apologies if this is somewhere and my searching skills failed me...