SR slaves and .pgpass

The docs state, w.r.t. $subject:

    The password can be provided either in the primary_conninfo string
    or in a separate ~/.pgpass file on the standby server.

I tried this with a database name of "replication" in the .pgpass file, 
which matches what we need to use in pg_hba.conf, but it failed 
miserably, and only worked when I used a wildcard for the database name 
in the .pgpass file.

If this is expected it needs to be documented more clearly; if not, it's 
a bug.

I expect this to be quite  a common thing to do - many people will be 
like me and dislike putting passwords in config files.

cheers

andrerw