Where can I get some design documents of mercurial?

[Sandy Young]

Hi,

I need to read design documents of mercurial to see if I can do some changes
on it, that because:

Now I'm going to make a file management system, requiring fast transform
speed and version control supported. I find mercurial is a great tool to
meet my requriements for its high preformance, especially for small text
files. But as most of SCM software, it has a very bad performance when
manage large binary files (>400M). So I want to find if there is a simple
way to make a bit of change on mercurial source code to support big file.

*Important:*
I don't need all functions of mercurial, but a small sub-set functions
include clone, push, pull, ci, up, add, so maybe my work is not so hard. ;)

Regards,
homer
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