[issue42482] TracebackException should not hold reference to the exception traceback

[Guido van Rossum]

Guido van Rossum <guido at python.org> added the comment:

For background, see https://github.com/iritkatriel/cpython/pull/3#issuecomment-734640036 -- it seems the link to exc_traceback was added with little concern for the original design of TracebackExceptionGroup.

The question is, can we get rid of it, even though it's been undocumented.

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