lib: Accept signed BSD-style checksums in verify_checksum#27
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Historical BSD tar wrote checksums using signed byte arithmetic (bytes >= 128 treated as negative i8 values), while POSIX standardized unsigned arithmetic. GNU tar, Python tarfile, Go archive/tar, and libarchive all accept both forms, let's do the same. Assisted-by: OpenCode (claude-sonnet-4-6@default) Signed-off-by: Colin Walters <walters@verbum.org>
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Historical BSD tar wrote checksums using signed byte arithmetic (bytes
Assisted-by: OpenCode (claude-sonnet-4-6@default)