Allow tooling like pg_receivexlog to run on computers with different 
architectures (Heikki Linnakangas)

This probably should be mentioned in the backwards-compatibility section. Any 3rd party tools that speak the streaming replication protocol are affected.

E. Write-Ahead Log (WAL)

    Store WAL in a continuous stream, rather than skipping the last 16MB 
segment every 4GB (Heikki Linnakangas) BACKWARD COMPATIBLE BREAK

    Restructure WAL files to better handle timeline changes during recovery 
(Heikki Linnakangas)

    Restructure WAL files to use a more compact storage format (Heikki 

Can you clarify which commits these came from? The first one is clear (dfda6eba), and I think the 3rd covers commits 20ba5ca6 and 061e7efb1. But what is that second entry?

- Heikki

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