-* Shallow clones.
-
-* Mark entries as "assume unchanged" in the index.
-
- <Pine.LNX.4.64.0601311807470.7301@g5.osdl.org>
-
- A config item '[core] trust_stat = false' would cause to:
-
- - "update-index" with or without --add would mark the path
- valid after registering. Should we make the working tree
- file read-only at this point?
-
- - checkout-index -u would mark the path and makes the working
- tree file read-only.
-
- - read-tree without -u would mark the path invalid.
-
- - update-index --refresh should *not* mark up-to-date paths valid.
-
- Impacts to various commands:
-
- - update-index --refresh would ignore them.
-
- - diff-files would say unchanged.
-
- - diff-index without --cached acts the same way as diff-index
- --cached.
-