[Updated] D8431: upgrade: support upgrade and downgrade from persistent nodemap

[marmoute (Pierre-Yves David)]

marmoute edited the summary of this revision.

REPOSITORY
  rHG Mercurial

CHANGES SINCE LAST ACTION
  https://phab.mercurial-scm.org/D8431/new/

REVISION DETAIL
  https://phab.mercurial-scm.org/D8431

To: marmoute, #hg-reviewers, mharbison72, Alphare
Cc: Alphare, mercurial-patches, mharbison72, mercurial-devel
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