Git branch is a reference of specific revision.
Git branch is equivalent with Mercurial *heads*.
http://mercurial.selenic.com/wiki/GitConcepts?action=recall&rev=53#Branch_model
32ae898b7 in git test repository is a merged revision with two heads.
713f49446 and 4a07fe31b *were* in different branches before merged.
713f49446 and 4a07fe31b are descendants of 61b685fbe5.
4a07fe31b is a child of 61b685fbe5.
To get revisions from 713f4944648826f5 to master,
"git log" needs to return 4a07fe31b.
