hg heads -a showing closed branch

[Peter Mayne]

If I create a branch in my repository (version 1.3 on Windows), then 
close that branch using "hg ci --close-branch", I get the following:

C:\tmp\repob>hg branches
default                        4:1f2fa654ab3d

C:\tmp\repob>hg branches -c
default                        4:1f2fa654ab3d
br1                            3:8160933f9b56 (closed)

C:\tmp\repob>hg heads -a
changeset:   4:1f2fa654ab3d
tag:         tip
parent:      2:664e7c45059a
user:        PJDM <Peter.Mayne at localhost>
date:        Wed Jul 08 22:46:27 2009 +1000
summary:     five

changeset:   3:8160933f9b56
branch:      br1
parent:      1:7d20e8592890
user:        PJDM <Peter.Mayne at localhost>
date:        Wed Jul 08 22:43:13 2009 +1000
summary:     close br1

Shouldn't "hg heads -a" only show the active head (default), and not the 
head from the closed branch (br1)? If so, wouldn't -a be a good default 
for "hg heads", as it appears to be for "hg branches"?

Thanks.

PJDM