D808: config: use copy-on-write to improve copy performance

[durin42 (Augie Fackler)]

durin42 accepted this revision as: durin42.
durin42 added a comment.


  A couple of nitpicks. I'm not super in love with this, but it seems to be enough of a huge win we should do it anyway. Sigh.

INLINE COMMENTS

> util.py:656
> +    """
> +    pass
> +

you can (and should) omit pass when you have a docstring

> util.py:663
> +    """
> +    pass
> +

you can (and should) omit pass when you also have a docstring

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D808

To: quark, #hg-reviewers, mbthomas, durin42
Cc: durin42, mbthomas, mercurial-devel