i18n/polib.LICENSE

dagop: just compare with the last value to deduplicate input of revancestors()

Since we're using a max heap, the current rev should be a duplicate only
if it equals to the previous one. We don't have to maintain the whole seen
set.

  # reverse(ancestors(tip)) using hg repo
  0) 0.086420
  1) 0.081051

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