On Aug 28, 2009, at 1:11 PM, Óscar Fuentes wrote:

> git
> requires quite a bit of mastership and knowing lots of things about  
> its
> inner workings.

When did you learn it?  Was that before or after their interface  
improvements in or around 2008?

I use git productively without knowing anything about their pack  
format, or when exactly it runs a garbage collection, or how the git  
transfer protocol works.  I do know that it's a graph structure, what  
they mean by HEAD, how a refid identifies a node on the graph,  why it  
changes if content or metadata of the node change, what it means to  
rebase (although the exact syntax I would look up).   All useful and  
beautiful concepts, easy to understand with some general computer  
science training.   And I think you'd have to know this stuff for Bzr  
or Hg, too.