> But there aren't very many FOSS clean-room implementations of Git, at least not this far down the chain (packfiles).

I know at least of gogit (https://github.com/speedata/gogit), if only a little, because I've contributed once to it. I don't want to belittle your project, but I'd like to know: what are the differences between gitgo and gogit ?

(I see at least one similarity: the name is extraordinarily unimaginative :)