bundle: Use OFS_DELTA in bundle files
git-bundle first appeared in 2e0afafe ("Add git-bundle") in Feb 2007, and first shipped in Git 1.5.1. However, OFS_DELTA is an even earlier invention, coming about in eb32d236 ("introduce delta objects with offset to base") in Sep 2006, and first shipped in Git 1.4.4.5. OFS_DELTA is smaller, about 3.2%-5% smaller, and is typically faster to access than REF_DELTA because the exact location of the delta base is available after parsing the object header. Since all bundle aware versions of Git are also OFS_DELTA aware, just make it the default. Signed-off-by: NShawn O. Pearce <spearce@spearce.org> Acked-by: NNicolas Pitre <nico@fluxnic.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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