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3e560af360
Preparation for widening the delta-encoding API to size_t in
subsequent commits, which is what lets pack-objects drop the
cast_size_t_to_ulong() shims that 606c192380 (odb, packfile: use
size_t for streaming object sizes, 2026-05-08) had to leave behind
in get_delta() and try_delta() because their downstream consumers
were still narrow.
The struct is private to diff-delta.c, so widening its fields in
isolation is a no-op at runtime: the values stored continue to fit
in 32 bits on Windows because the public API around it still
truncates. Splitting it out keeps the API-change commit focused on
caller updates.
Assisted-by: Opus 4.7
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>