Merge branch 'mk/unpack-careful'

* mk/unpack-careful:
  t5300: add test for "index-pack --strict"
  receive-pack: allow using --strict mode for unpacking objects
  unpack-objects: fix --strict handling
  t5300: add test for "unpack-objects --strict"
  unpack-objects: prevent writing of inconsistent objects

diff --cc Documentation/config.txt
Simple merge

diff --cc t/t5300-pack-object.sh
Simple merge