== New Features ==

 * `hg purge` is now a core command using `--confirm` by default.

 * The `rev-branch-cache` is now updated incrementally whenever changesets

   are added.

 * The new options `experimental.bundlecompthreads` and

   `experimental.bundlecompthreads.<engine>` can be used to instruct

   the compression engines for bundle operations to use multiple threads

   for compression. The default is single threaded operation. Currently

   only supported for zstd.

== New Experimental Features ==

 * There's a new `diff.merge` config option to show the changes

    relative to an automerge for merge changesets. This makes it

    easier to detect and review manual changes performed in merge

    changesets. It is supported by `hg diff --change`, `hg log -p`

    `hg incoming -p`, and `hg outgoing -p` so far.

== Bug Fixes ==

== Backwards Compatibility Changes ==

 * In normal repositories, the first parent of a changeset is not null,

   unless both parents are null (like the first changeset). Some legacy

   repositories violate this condition. The revlog code will now

   silentely swap the parents if this condition is tested. This can

   change the output of `hg log` when explicitly asking for first or

   second parent.

== Internal API Changes ==

 * `changelog.branchinfo` is deprecated and will be removed after 5.8.

   It is superseded by `changelogrevision.branchinfo`.

 * Callbacks for revlog.addgroup and the changelog._nodeduplicatecallback hook

   now get a revision number as argument instead of a node.

 * revlog.addrevision returns the revision number instead of the node.

 * `nodes.nullid` and related constants are being phased out as part of

   the deprecation of SHA1. Repository instances and related classes

   provide access via `nodeconstants` and in some cases `nullid` attributes.