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# Mercurial 5.6 (2020-10-29)
## New Features
- `hg mv -A` can now be used with `--at-rev`. It behaves just like `hg cp -A --at-rev`, i.e. it marks the destination as a copy of the source whether or not the source still exists but the source must exist in the parent revision).
- New revset predicate `diffcontains(pattern)` for filtering revisions the same way as `hg grep --diff pattern`.
- The memory footprint per changeset and per file during pull/unbundle operations has been significantly reduced.
## Internal API Changes
- `merge.update()` is now private (renamed to `_update()`). Hopefully the higher-level functions available in the same module cover your use cases.
- `phases.registernew` now takes a set of revisions instead of a list of nodes. `phases.advanceboundary` takes an optional set of revisions in addition to the list of nodes. The corresponeding members of the `phasecache` class follow this change.
- The `addgroup` member of `revlog` classes no longer keeps a list of all found nodes. It now returns True iff a node was found in the group. An optional callback for duplicated nodes can be used by callers to keep track of all nodes themselve.
- The `_chaininfocache` of `revlog` classes has been changed from a dict to a LRU cache.
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