Desired use case for obsmarkers / visibility

Jun Wu quark at
Wed Nov 15 14:12:42 EST 2017

Excerpts from Augie Fackler's message of 2017-11-15 11:23:25 -0500:
> I don't disagree, but it's *extremely* rare experimentally on hg. I'd
> encourage running a similar analysis on your own repositories to get a
> sense of how many prunes have ever been meaningfully exchanged. I bet it's
> a fraction of a percent of markers, and happens extremely rarely overall.

I think there are 2 kinds of "prune"s that might be treated differently:

  o C                       o C
  |                         |
  x B (B -> (), parent A)   | x B (B -> (), parent A)
  |                         |/
  o A                       o A

When pulling "C", I guess it's reasonable to pull the marker for the left
case.  The right case might want an option.

Practically, it's doable by ignoring the "parent" field in markers.

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