[Python-Dev] I am now lost - committed, pulled, merged, what is "collapse"?

[skip at pobox.com]

I have a trivial little documentation patch for csv.rst.  I committed it
locally, then I pulled and merged:

    cpython% hg pull
    pulling from ssh://hg@hg.python.org/cpython
    searching for changes
    adding changesets
    adding manifests
    adding file changes
    added 94 changesets with 422 changes to 154 files (+1 heads)
    (run 'hg heads' to see heads, 'hg merge' to merge)
    cpython% hg merge
    132 files updated, 0 files merged, 0 files removed, 0 files unresolved
    (branch merge, don't forget to commit)

hg heads showed my changeset:

    changeset:   68585:c63d7374b89a
    user:        Skip Montanaro <skip at pobox.com>
    date:        Sat Mar 19 09:09:30 2011 -0500
    summary:     Mention RFC 4180.  Based on input by Tony Wallace in issue 11456.

I committed.  Now:

    changeset:   68680:64eeb4cd4b56
    tag:         tip
    parent:      68585:c63d7374b89a
    parent:      68679:dfceb98767c0
    user:        Skip Montanaro <skip at pobox.com>
    date:        Sat Mar 19 09:15:28 2011 -0500
    summary:     commit merge

The dev guide says something about collapsing changesets.  Is that
collapsing commits within a changeset or collapsing multiple changesets
(whatever that might be)?  Do I need this for a trivial change?  Can I just
push at this point?  Once pushed, how does it get merged into the main
codebase?

Skip