kevincox added inline comments.

INLINE COMMENTS

> gracinet wrote in dagops.rs:96
> Thanks for the suggestion.
> 
> Anticipating on a discussion to have later, I'd like eventually the 
> `Graph::parents()` returns an iterator. The advantages will be made obvious 
> by the (not submitted yet) final changesets of the` PartialDiscovery`  
> implementation in `hg-core`.  In other words, `NULL_REVISION` and the fact to 
> have exactly two parents should be considered implementation details of the 
> underlying storage.

That sounds great. `NULL_REVISION` always seemed quite messy to me. It would 
definitely be best to filter it out as soon as possible.

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D6230

To: gracinet, #hg-reviewers, kevincox
Cc: durin42, kevincox, mercurial-devel
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