Should we also use https://tskit.dev/tskit/docs/stable/c-api.html#c.TSK_TS_INIT_COMPUTE_MUTATION_PARENTS in TableCollection$tree_sequence()?
Jerome says: "I don't think it's relevant to the Python API AFAIK, but I guess it could be filtered through to TableCollection.tree_sequence()? IIRC it got added to keep existing C code working when we tightened up the requirements, but should probably be avoided in new code. I'd say just not document it unless there's a compelling use-case in new code".