branchcache: skip entries that are topological heads in the on disk file In the majority of cases, topological heads are also branch heads. We have efficient way to get the topological heads and efficient way to retrieve their branch information. So there is little value in putting them in the branch cache file explicitly. On the contrary, writing them explicitly tend to create very large cache file that are inefficient to read and update. So the branch cache v3 format is no longer including them. This changeset focus on the format aspect and have no focus on the performance aspect. We will cover that later.

# Declare macOS-specific requirements for generating
# the compiled (frozen) set of requirements in
# ./requirements-macos.txt.
# If run on Windows, it may be necessary to run dos2unix
# on the output file to replace any CRLF newlines with LF.

# TODO: dulwich, pygit2, and pytest-vcr are flagged as being
#  incompatible with in-memory resources.  Maybe there's a
#  way to bundle just them externally.

docutils
#dulwich

# Needed by the release note tooling
fuzzywuzzy

keyring
#pygit2
pygments

# Needed by the phabricator tests
#pytest-vcr