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In classDiagram methods: abstract, static and return value are conflicting

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 Note that Mermaid Preview is also sometimes in trouble: 

datetime.timestamp() fails before 1970-01-02T01:00:00.000000

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Python 3.8.10 datetime 4.4 Windows 10 datetime(1970,1,1,0,0,0).timestamp() # OSError: [Errno 22] Invalid argument datetime(1970,1,1,23,59,59,999999).timestamp() # OSError: [Errno 22] Invalid argument datetime(1970,1,2,0,59,59,999999).timestamp() # OSError: [Errno 22] Invalid argument Minimal datetime where...