Re: What's cooking in git.git (Sep 2018, #03; Fri, 14)

> * ds/format-commit-graph-docs (2018-08-21) 2 commits
>   - commit-graph.txt: improve formatting for asciidoc
>   - Docs: Add commit-graph tech docs to Makefile
>
>   Design docs for the commit-graph machinery is now made into HTML as
>   well as text.
>
>   Will discard.
>   I am inclined to drop these, as I do not see much clarity in HTML
>   output over the text source.  Opinions?

> * ds/commit-graph-with-grafts (2018-08-21) 8 commits
>   - commit-graph: close_commit_graph before shallow walk
>   - commit-graph: not compatible with uninitialized repo
>   - commit-graph: not compatible with grafts
>   - commit-graph: not compatible with replace objects
>   - test-repository: properly init repo
>   - commit-graph: update design document
>   - refs.c: upgrade for_each_replace_ref to be a each_repo_ref_fn callback
>   - refs.c: migrate internal ref iteration to pass thru repository argument
>
>   The recently introduced commit-graph auxiliary data is incompatible
>   with mechanisms such as replace & grafts that "breaks" immutable
>   nature of the object reference relationship.  Disable optimizations
>   based on its use (and updating existing commit-graph) when these
>   incompatible features are in use in the repository.
>
>   Replaced with a newer version.