rebase --autosquash does not handle fixup! of fixup!

git rebase -i --autosquash does not handle a fixup! of a fixup!, such as
the history:

    aaaaaaa fix nasty bug
    ...
    bbbbbbb fixup! fix nasty bug
    ...
    ccccccc fixup! fixup! fix nasty bug

--autosquash produces:

    pick aaaaaaa fix nasty bug
    fixup bbbbbbb fixup! fix nasty bug
    ...
    pick ccccccc fixup! fixup! fix nasty bug

This defeats the workflow I was hoping to use:

    git commit -m 'fix nasty bug'
    ...
    git commit --fixup :/nasty
    ...
    git commit --fixup :/nasty

The second :/nasty resolves to the previous fixup, not the initial
commit.  I could have made the regular expression more precise, but this
would be a hassle.

Would a change to support fixup! fixup! be considered?

Andrew

(Please Cc: me on replies.)