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== New Features ==
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* clonebundles can be annotated with the expected memory requirements
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using the `REQUIREDRAM` option. This allows clients to skip
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bundles created with large zstd windows and fallback to larger, but
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less demanding bundles.
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* The `phabricator` extension now provides more functionality of the
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arcanist CLI like changing the status of a differential.
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* Phases processing is much faster, especially for repositories with
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old non-public changesets.
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== New Experimental Features ==
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* The core of some hg operations have been (and are being)
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implemented in rust, for speed. `hg status` on a repository with
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300k tracked files goes from 1.8s to 0.6s for instance.
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This has currently been tested only on linux, and does not build on
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windows. See rust/README.rst in the mercurial repository for
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instructions to opt into this.
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== Backwards Compatibility Changes ==
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* Mercurial now requires at least Python 2.7.9 or a Python version that
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backported modern SSL/TLS features (as defined in PEP 466), and that Python
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was compiled against a OpenSSL version supporting TLS 1.1 or TLS 1.2
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(likely this requires the OpenSSL version to be at least 1.0.1).
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* The `hg perfwrite` command from contrib/perf.py was made more flexible and
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changed its default behavior. To get the previous behavior, run `hg perfwrite
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--nlines=100000 --nitems=1 --item='Testing write performance' --batch-line`.
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== Internal API Changes ==
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* logcmdutil.diffordiffstat() now takes contexts instead of nodes.
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* The `mergestate` class along with some related methods and constants have
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moved from `mercurial.merge` to a new `mercurial.mergestate` module.
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* The `phasecache` class now uses sparse dictionaries for the phase data.
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New accessors are provided to detect if any non-public changeset exists
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(`hasnonpublicphases`) and get the correponsponding root set
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(`nonpublicphaseroots`).
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