diff mercurial/configitems.py @ 44313:6f9e8e142cea

nodemap: add a (python) index class for persistent nodemap testing

Using the persistent nodemap require a compeling performance boost and an
existing implementation. The benefit of the persistent nodemap for pure python
code is unclear and we don't have a C implementation for it. Yet we would like
to actually start testing it in more details and define an API for using that
persistent nodemap.

We introduce a new `devel` config option to use an index class dedicated to
Nodemap Testing. This feature is "pure" only because having using a pure-python
index with the `cext` policy proved more difficult than I would like.

There is nothing going on in that class for now, but the coming changeset will
change that.

Differential Revision: https://phab.mercurial-scm.org/D7840

--- a/mercurial/configitems.py	Wed Jan 15 15:47:59 2020 +0100
+++ b/mercurial/configitems.py	Wed Jan 15 15:48:09 2020 +0100
@@ -406,6 +406,9 @@
     b'devel', b'legacy.exchange', default=list,
 )
 coreconfigitem(
+    b'devel', b'persistent-nodemap', default=False,
+)
+coreconfigitem(
     b'devel', b'servercafile', default=b'',
 )
 coreconfigitem(