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== New Features ==
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* `hg purge` is now a core command using `--confirm` by default.
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* The `rev-branch-cache` is now updated incrementally whenever changesets
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are added.
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* The new options `experimental.bundlecompthreads` and
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`experimental.bundlecompthreads.<engine>` can be used to instruct
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the compression engines for bundle operations to use multiple threads
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for compression. The default is single threaded operation. Currently
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only supported for zstd.
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== Default Format Change ==
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These changes affects newly created repositories (or new clone) done with
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Mercurial 5.8.
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* The `ZSTD` compression will now be used by default for new repositories
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when available. This compression format was introduced in Mercurial 5.0,
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released in May 2019. See `hg help config.format.revlog-compression` for
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details.
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* Mercurial installation built with the Rust parts will now use the
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"persistent nodemap" feature by default. This feature was introduced in
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Mercurial 5.4 (May 2020). However Mercurial instalation built without the
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fast Rust implementation will refuse to interract with them by default.
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This restriction can be lifted through configuration.
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See `hg help config.format.use-persistent-nodemap` for details
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== New Experimental Features ==
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* There's a new `diff.merge` config option to show the changes
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relative to an automerge for merge changesets. This makes it
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easier to detect and review manual changes performed in merge
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changesets. It is supported by `hg diff --change`, `hg log -p`
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`hg incoming -p`, and `hg outgoing -p` so far.
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== Bug Fixes ==
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* gracefully recover from inconsistent persistent-nodemap data from disk.
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== Backwards Compatibility Changes ==
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* In normal repositories, the first parent of a changeset is not null,
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unless both parents are null (like the first changeset). Some legacy
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repositories violate this condition. The revlog code will now
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silentely swap the parents if this condition is tested. This can
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change the output of `hg log` when explicitly asking for first or
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second parent. The changesets "nodeid" are not affected.
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== Internal API Changes ==
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* `changelog.branchinfo` is deprecated and will be removed after 5.8.
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It is superseded by `changelogrevision.branchinfo`.
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* Callbacks for revlog.addgroup and the changelog._nodeduplicatecallback hook
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now get a revision number as argument instead of a node.
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* revlog.addrevision returns the revision number instead of the node.
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* `nodes.nullid` and related constants are being phased out as part of
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the deprecation of SHA1. Repository instances and related classes
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provide access via `nodeconstants` and in some cases `nullid` attributes.
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