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MD5 not validated during MPU commit
The RFD for server-side MPU indicates that the MD5 of the final object content should be returned during commit. It seems like there is no checksumming of the encrypted object content implemented right now.
Some manual testing revealed that the server's response on complete does not include the MD5 either so this might need to be reported upstream as well.
To clarify: the RFD states that mako-finalize returns the MD5, it says nothing about actually giving it to the user.
A feature request has been logged for this. I'll need to put together a PR for performing a running checksum of the MPU upload as well and can work on that concurrently with the server-side work.