pg_stat_replication log positions vs base backups

Are the values for the log locations really relevant for backup
connections? And if they are, we need to document it :) ISTM we are just
more or less leaking random data out there?

I'm talking about the actual state=backup connection - not the connection
if we're using -x with pg_basebackup. Where we have output like:

state | backup
sent_location | 0/0
write_location | 2/76CE0000
flush_location | 2/76CC0000
replay_location | 2/76CBF938

I'm thinking those fields should probably all be NULL for state=backup?

--
Magnus Hagander
Me: http://www.hagander.net/
Work: http://www.redpill-linpro.com/