How do I define my type based on class so I can use that type in typecase and related expressions?

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How do I define my type based on class so I can use that type in typecase and related expressions?
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(stackoverflow.com/users/9840917/myname)myname
(stackoverflow.com/users/124319/coredump)coredump
(stackoverflow.com/users/69545/rainer-joswig)Rainer Joswig
(stackoverflow.com/users/9690090/gwang-jin-kim)Gwang-Jin Kim
(stackoverflow.com/users/9690090/gwang-jin-kim)Gwang-Jin Kim
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