Merge branch 'ps/build-sign-compare'

Last-minute fix for a regression in "git blame --abbrev=<length>" when insane <length> is specified; we used to correctly cap it to the hash output length but broke it during the cycle. * ps/build-sign-compare: builtin/blame: fix out-of-bounds write with blank boundary commits builtin/blame: fix out-of-bounds read with excessive `--abbrev`