Unique indexes on system tables

Hiroshi, there are two things I want to do for 7.0.

First, I want to make more of the system indexes unique. Are you aware
of any reasons not to do that? I see you have done some of them
already. I talked to Tom Lane, and he thinks that it will not cause
problems because unique insertions/updates wait for transactions to
commit before doing a conflicting change to the index, right?

Second, I want to add more system indexes to match all caches. Anything
that could cause problems there?

Are you working on any of this?

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