yuja added a comment.

  >   I was also thinking we could do that, but it feels like a workaround to 
me. I think of bookmarks and tags as pointing to specific commits. I think of 
branches as being many commits. `hg help revisions` says this:
  >   
  >     Any other string is treated as a bookmark, tag, or branch name. A 
bookmark
  >     is a movable pointer to a revision. A tag is a permanent name associated
  >     with a revision. A branch name denotes the tipmost open branch head of
  >     that branch - or if they are all closed, the tipmost closed head of the
  >     branch. Bookmark, tag, and branch names must not contain the ":"
  >     character.
  >   
  >   It specifically mentions bookmarks, tags, and branches, and it describes 
how each name resolves to a commit. To me, that makes it sound like some 
symbols can resolve to multiple commits. And indeed, revset aliases can already 
resolve to multiple commits.
  
  I read it implying that any sort of symbol resolves to a single revision since
  all three core "names" work in such way. I'm not against adding multi-node
  symbol resolution because it seems useful, but I agree with Sean that it would
  introduce inconsistency.
  
  I have no idea about the `namemap()` API.

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D3715

To: martinvonz, #hg-reviewers, durin42
Cc: yuja, durin42, smf, lothiraldan, mercurial-devel
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