[Openid-specs-ab] Issue #1156: Federation: 4.1.1. subset_of edge cases (openid/connect)

[Vladimir Dzhuvinov]

New issue 1156: Federation:  4.1.1. subset_of edge cases
https://bitbucket.org/openid/connect/issues/1156/federation-411-subset_of-edge-cases

Vladimir Dzhuvinov:

[https://openid.net/specs/openid-connect-federation-1\_0.html#rfc.section.4.1.1](https://openid.net/specs/openid-connect-federation-1_0.html#rfc.section.4.1.1)

Is my reading of the spec correct that applying the `subset_of` operation to a JSON array metadata parameter must never produce a policy error? So, if the parameter is `null`, empty JSON array or no values intersect, then the result must be an empty JSON array `[]` ?

The bottom of section 4.3 implies that producing empty arrays is OK: [https://openid.net/specs/openid-connect-federation-1\_0.html#rfc.section.4.3](https://openid.net/specs/openid-connect-federation-1_0.html#rfc.section.4.3)

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