Compaction with mandated context incompatible with OIDC

[woutermont]

While experimenting in the JSON-LD Playground, I stumbled upon the following issue, which I could only solve by diverting from the mandated JSON-LD context.

Starting from the example Client ID Document in 5.1, when expanding with the context and then compacting the result again, the "redirect_uris": ["https://app.example/callback"] statement becomes:

"redirect_uris": {
    "@none": [
        "https://app.example/callback"
    ]
}

This is obviously not what we want, in order to be compatible with OIDC Dynamic Registration syntax. It is due to redirect_uris being configured as a JSON-LD ID Map in the context, as follows.

"redirect_uris": {
    "@id": "oidc:redirect_uris",
    "@type": "@id",
    "@container": [
        "@id",
        "@set"
    ]
}

That data structure is meant for maps, both the key and the value of which are (named) nodes. A set of redirect URIs, however, is just a set of nodes, not a map. I therefore believe the @id annotation of @container should be removed, leaving just "@container": "@set", which results in the correct expansion.