revlog: return sidedata map from `_revisiondata`
Nothing extra any side data yet. However, it will happens in the future. So we
better prepare the callers of the `_revisiondata` to deal with it.
Differential Revision: https://phab.mercurial-scm.org/D6809
#require test-repo pylint hg10
Run pylint for known rules we care about.
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There should be no recorded failures; fix the codebase before introducing a
new check.
Current checks:
- W0102: no mutable default argument
$ touch $TESTTMP/fakerc
$ pylint --rcfile=$TESTTMP/fakerc --disable=all \
> --enable=W0102,C0321 \
> --reports=no \
> --ignore=thirdparty \
> mercurial hgdemandimport hgext hgext3rd | sed 's/\r$//'
Using config file *fakerc (glob) (?)
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