Walgit leans on S3 primitives but has classic distsys bugs

发生了什么
Walgit leans on S3 primitives but has classic distsys bugs Tests pass cuz its memstore makes cond deletes But w/ S3 it HEAD->compare->DELETE so stale owner can delete new lease The code incorrectly says S3 lacks conditional DELs. Which AI model wrote this? It's wrong in basics
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