Require Interfaces to have 1+ Objects implementing

At a glance

• Identifier: #460
• Stage: RFCX: Closed 2018-10-02T03:44:19Z
• Champion: @mjmahone
• PR: Require Interfaces to have 1+ Objects implementing

Timeline

• Commit pushed: Merge branch 'master' into rfc-interfaces-implemented on 2018-06-11 by @leebyron
• Spec PR created on 2018-06-08 by mjmahone
• Commit pushed: RFC: Require Interfaces to implement 1+ Objects. on 2018-06-08 by @mjmahone

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Re-applies #424, but as an RFC. This change is a major spec breaking change, and if it is desire-able, we should provide an upgrade path for existing schemas.