Require Interfaces to have 1+ Objects implementing

At a glance

• Identifier: #460
• Stage: RFC X / Rejected
• Champion: @mjmahone
• Latest activity: 1 commit pushed on 2018-06-11
• Spec PR: https://github.com/graphql/graphql-spec/pull/460

Spec PR description

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.

Timeline

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