Streaming writers (Python's unseekable ZipFile, force_zip64) write ZIP64
data descriptors even for small files, so the descriptor width can't be
taken from the final sizes. The reader now accepts the signed or unsigned,
32- or 64-bit layout that matches the central directory and fits before
the next entry, preferring one that ends exactly there, then the width the
local header's ZIP64 metadata implies. Format tests cover streamed ZIP64
stored and deflated entries.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
