Avoid the massive end-to-end tax of default full history clones

It's easy to think of git clone as a client-side operation, but the settings of this operation impact the server side and all networks in between. When you run a default full history clone, the server has to walk the entire history, build a pack file for it (that's what "counting objects" is actually doing), and ship it over the wire. The client then unpacks all of it and checks out a full working tree.