Is there a discussion somewhere regarding this line from the docs on
transaction isolation: "When you select the level Read Uncommitted you
really get Read Committed, and phantom reads are not possible in
the PostgreSQL implementation of Repeatable Read"? I get that RU is the
same as RC and why that is so, but why is RR mentioned in this sentence
and more importantly why does it claim phantom reads aren't possible in
RR despite the table above this paragraph clearly stating they are? It
looks like a documentation issue associated with the true serialization
mode introduced in 9.1.
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