STINNER Victor <vstin...@python.org> added the comment:

> tp_traverse is optional, so we should not add this assertion.

It is required by types implementing the GC protocol. This assumption is 
non-obvious and was not documented. The documentation was completed in 
bpo-44263 by commit 8b55bc3f93a655bc803bff79725d5fe3f124e2f0.

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