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I believe the "Quality problems" listed for MUMv3 on the readme do not match the results you listed elsewhere.
The code here is MUMv3 as of 2020, so it does not have the updated code released this year. I will make a separate PR for that. (There is new defined macros which apparently allow it to pass these tests from SMHasher, allow target independent hashes. There is also a new hash called VMUM which is a departure from V1, V2, V3)