Add objectFormat setting to allow init()ing a repo with sha256

Add objectFormat setting to allow init()ing a repo with sha256

Add objectFormat setting to allow init()ing a repo with sha256

always use sha256

Force sha256 object format

Add objectFormat setting to allow init()ing a repo with sha256

Add objectFormat setting to allow init()ing a repo with sha256

force sha256 on init

Actually use objectFormat setting in init

Add objectFormat setting to allow init()ing a repo with sha256