>> We should also condense the sources file and remove deprecated
>> methods.  We're early in the cycle, this is a good time to "break"
>> code still using 3.9Deprecated methods.
>
> IMHO condensing should be done before the release. It's not possible to tell
> a 4.2 image to use a different sources file without changing it.
> For 4.3 it doesn't worth condensing now, because we will do further changes,
> which would generate cruft in the file (compared to condensing before the
> release).

Each release should be able to present it's deltas to the prior
release.  That is not cruft.