backport #10472 to v1.21.0

[magik6k]

Related Issues

Backports #10472 into v1.21.0

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[Stebalien]

We should consider a max walk height as an alternative (although @arajasek's tipset skiplist changes may change that?).

[magik6k]

We should consider a max walk height as an alternative (although @arajasek's tipset skiplist changes may change that?).

Even with max walk height I believe having this special case for genesis is technically more correct (tho my node still syncs fine without it, so really it probably doesn't matter that much, beyond maybe marginal perf gain)