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Follow up to #12701, which introduced a new regression. When profiling locally I noticed that writes have the tendency to always reallocate. On investigation I found that even if the `Connection`'s write buffer is empty, if it still shares the same data pointer as the `Client`'s write buffer then the client cannot reclaim it. The best way I found to fix this is to just drop the `Connection`'s write buffer each time we fully flush it. Additionally, I remembered that `BytesMut` has an `unsplit` method which is allows even better sharing over the previous optimisation I had when 'encoding'.
This directory contains libraries that are specific for proxy.
Currently, it contains a signficant fork/refactoring of rust-postgres that no longer reflects the API of the original library. Since it was so significant, it made sense to upgrade it to it's own set of libraries.
Proxy needs unique access to the protocol, which explains why such heavy modifications were necessary.