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What's the problem this PR addresses?
The lockfile has a very small optimization feature: instead of repeating the cache key across all checksums, it keeps a global cache key at the top of the file, which it uses everytime a checksum is missing a cache key. This saves a few bytes.
However, I found out this behaviour causes breakages under some situations:
foo
foo
entry added by Alice has no cache key, since it was added at a time its cache key matched the global oneHow did you fix it?
The checksum cache key is now always set.
Checklist