git treats objects as a generic structure ("list of space-separated name-value pairs, maybe with space continuations, followed by double newline, followed my me

git treats objects as a generic structure ("list of space-separated name-value pairs, maybe with space continuations, followed by double newline, followed my message") followed by additional rules for individual values. Something very common in older protocols -- see HTTP, deb control files, email, etc... And github code decided to short-circuit the process and combine two steps into one, which introduced weird inter-layer interactions where lines with good name but invalid content would be silently rejected.