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Durham Goode authored
When commiting to a repo with lots of history (>400000 changesets)
checking the results of revset.py:descendants against the subset takes
some time.  Since the subset equals the entire changelog, the check
isn't necessary.  Avoiding it in that case saves 0.1 seconds off of
a 1.78 second commit. A 6% gain.

We use the length of the subset to determine if it is the entire repo.
There is precedence for this in revset.py:stringset.
54cedee8
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setup.py
Mercurial
=========

Mercurial is a fast, easy to use, distributed revision control tool
for software developers.

Basic install:

 $ make            # see install targets
 $ make install    # do a system-wide install
 $ hg debuginstall # sanity-check setup
 $ hg              # see help

Running without installing:

 $ make local      # build for inplace usage
 $ ./hg --version  # should show the latest version

See http://mercurial.selenic.com/ for detailed installation
instructions, platform-specific notes, and Mercurial user information.