Nice post Arsney. I like that you went in to detail with regards to how the delete marker works with cross-region replication. Bookmarking this one for future referance.
In fact - I didn't need to delete objects, but tried it just out of curiosity and found, that AWS's documentation is absolutely unclear and messed about that (surprise, as usually, AWS docs are perfect).
So I did a bit investigation for myself to find a way to delete objects.
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