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filecache: unimplement __set__() and __delete__() (API)...
filecache: unimplement __set__() and __delete__() (API) Implementing __set__() implies that the descriptor can't be overridden by obj.__dict__, which means any property access involves slow function call. "Data descriptors with __set__() and __get__() defined always override a redefinition in an instance dictionary. In contrast, non-data descriptors can be overridden by instances." https://docs.python.org/2.7/reference/datamodel.html#invoking-descriptors This patch basically backs out 236bb604dc39, "scmutil: update cached copy when filecached attribute is assigned (issue3263)." The problem described in issue3263 (which is #3264 in Bugzilla) should no longer happen since repo._bookmarkcurrent has been moved to repo._bookmarks.active. We still have a risk of introducing similar bugs, but I think that's the cost we have to pay. $ hg perfrevset 'branch(tip)' -R mercurial (orig) wall 0.139511 comb 0.140000 user 0.140000 sys 0.000000 (best of 66) (prev) wall 0.114195 comb 0.110000 user 0.110000 sys 0.000000 (best of 81) (this) wall 0.099038 comb 0.110000 user 0.100000 sys 0.010000 (best of 93)
Jordi Gutiérrez Hermoso - - Load All Authors

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extensions.txt
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Mercurial has the ability to add new features through the use of
extensions. Extensions may add new commands, add options to
existing commands, change the default behavior of commands, or
implement hooks.
To enable the "foo" extension, either shipped with Mercurial or in the
Python search path, create an entry for it in your configuration file,
like this::
[extensions]
foo =
You may also specify the full path to an extension::
[extensions]
myfeature = ~/.hgext/myfeature.py
See :hg:`help config` for more information on configuration files.
Extensions are not loaded by default for a variety of reasons:
they can increase startup overhead; they may be meant for advanced
usage only; they may provide potentially dangerous abilities (such
as letting you destroy or modify history); they might not be ready
for prime time; or they may alter some usual behaviors of stock
Mercurial. It is thus up to the user to activate extensions as
needed.
To explicitly disable an extension enabled in a configuration file of
broader scope, prepend its path with !::
[extensions]
# disabling extension bar residing in /path/to/extension/bar.py
bar = !/path/to/extension/bar.py
# ditto, but no path was supplied for extension baz
baz = !