git commit -C vs. prepare-commit-msg hook

Hi,

Just noticed (read: got bitten by ;) that 'git commit' runs the prepare-commit-msg hook even if it was invoked with the -C option. This seems contradictory to me, because 'git commit -C' is to reuse an already existing log message (and author info) as is, whereas prepare-commit-msg is there to automatically edit the commit message.

Is this desired and I'm missing something, or is this a bug? (or just accidental, but we can't do anything about it anyway because of backward compatibility?)

Thanks.

Best, Gábor