Bug report: 'git rebase' confusing files with initially equal content

With the following steps content from one file ends up in another file 
by using 'git rebase' (and clobbers the original content).
It is rather straight forward and I discovered this behaviour when 
trying to replay http://gitforteams.com/resources/rebasing.html .
The special thing is, that both files have the same content at start.

   $ mkdir rebase
   $ cd rebase
   git --version
   git version 2.9.0
   $ git init
   Initialized empty Git repository in /home/graf/projects/git/rebase/.git/
   $ echo stub >file1
   $ echo stub >file2
   $ git add .
   $ git commit -m 'add stub'
   [master (root-commit) 0cb53e9] Add stubs
    2 files changed, 2 insertions(+)
    create mode 100644 file1
    create mode 100644 file2
   $ git checkout -b feature/1
   Switched to a new branch 'feature/1'
   $ echo line1 >file1
   $ git commit -am 'Add content'
   [feature/1 2f3dcc7] Add content
    1 file changed, 1 insertion(+), 1 deletion(-)
   $ git checkout master
   Switched to branch 'master'
   $ git rm file1
   rm 'file1'
   $ git commit -m 'Delete file1'
   [master 1b18590] Delete file1
    1 file changed, 1 deletion(-)
    delete mode 100644 file1
   $ git checkout feature/1
   Switched to branch 'feature/1'
   $ echo line2 >>file1
   $ git commit -am 'Add more content'
   [feature/1 36be376] Add more content
    1 file changed, 1 insertion(+)
   $ cat file1
   line1
   line2
   $ cat file2
   stub
   $ git rebase master
   First, rewinding head to replay your work on top of it...
   Applying  Add content
   Using index info to reconstruct a base tree...
   A	file1
   Falling back to patching base and 3-way merge...
   Auto-merging file2
   Applying  Add more content
   Using index info to reconstruct a base tree...
   A	file1
   Falling back to patching base and 3-way merge...
   Auto-merging file2
   $ ls -l
   total 8
   -rw-r--r--  1 graf  users  12 14 Jul 13:16 file2
   $ cat file2
   line1
   line2

If instead file1 and file2 initially had different contents, 'git 
rebase' runs into a merge conflict, so the user can fix it appropriatly.

I suppose this is related to the fact that Git manages the repo by file 
contents only. Still this is nothing what I would expect (and neither 
accept).

-- 
Bernhard Graf