Cheuk Ting Ho

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According to this (https://docs.python.org/3/c-api/typeobj.html#c.PyTypeObject.tp_subclasses) seems `tp_subclasses` is for internal use only. Maybe we should work on `__bases__` and `__mro__` first.

@davidhewitt is this issue ready to be closed? Seems the PR has been merged

I see, I am happy to work on deprecating the `PyUnicode` alias, do we need to produce a warning or what's the plan for deprecating it other than removing it...

Thanks for the suggestions @davidhewitt i have added the test and have refactored as suggested.

Thank you for your patience. I was busy with EuroPython. I plan to finish this PR this weekend or next week.

I will have a look again at this, I think we can seal more traits. Will ask for a review again when it is ready.

@davidhewitt I have tried sealing most of the traits in `pyclass.rs` and it seems more complicated than what I did before (involving some macro as well). Do you want to...

@davidhewitt since it has been a while, shall I rebase and wrap it up, so that this can be merged? We can come back to finish off this issue later...