[Differential] [Accepted] D32: revlog: use struct.Struct instances for slight performance wins

[durin42 (Augie Fackler)]

durin42 accepted this revision.
durin42 added a comment.
This revision is now accepted and ready to land.


  (This is already pushed)

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D32

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To: alex_gaynor, durin42
Cc: dsp, mercurial-devel