Re: [PATCH 03/16] replace-object: move replace_map to object store

Stefan Beller [off-list ref] writes:

Signed-off-by: Stefan Beller <redacted>
---
 object-store.h   |  8 ++++++++
 replace-object.c | 17 +++++++----------
 replace-object.h |  9 +++++++++
 3 files changed, 24 insertions(+), 10 deletions(-)
 create mode 100644 replace-object.h

With this, the relationship between an object X and another object Y
that replaces the object X is defined only within the scope of a
single repository.

The exception in reachability rule around these replacement objects
is also local to a repository (i.e. if traversal from refs reaches
X, then both X and Y are reachable and need to be kept from gc), so
I think this is a reasonable way to arrange things.