D2692: merge: return an attrs class from update() and applyupdates()

[indygreg (Gregory Szorc)]

indygreg added a comment.


  `__slots__` allocates enough space for the exact set of attributes specified rather than backing object instances by `__dict__`. If you create thousands of small objects that all have the same fields, `__slots__` can yield some performance wins.

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D2692

To: indygreg, #hg-reviewers, martinvonz
Cc: martinvonz, mercurial-devel