More comments on role subtyping, unsoundness fix.
Summary: - We incorrectly allowed subroling on injective data in some cases. There is now a test to check for this case, and a Note. - More commentary on how the subtyping with roles works. Signed-off-by: Edward Z. Yang <email@example.com> Test Plan: validate Reviewers: goldfire, austin, simonpj, bgamari Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D3222
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