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Changeset ID
A changeset ID is a 160-bit identifier that uniquely describes a [:ChangeSet:changeset] and its position in the change history of a [:Repository:repository], regardless of which machine or repository it's on. This is represented to the user as a 40 digit hexadecimal number. Technically, a changeset ID is a [:Nodeid:nodeid].
Short-form Changeset IDs
Since a 40 digit hex number is unwieldy, Mercurial will accept any unambiguous prefix of a changeset ID as shorthand for that ID.
When printing a changeset ID, Mercurial usually prints just the first twelve characters. This is called the "short form" of the ID.
Note: a short-form ID can start out valid, but become invalid because another changeset with the same prefix shows up later on. Do not use short-form IDs for long-lived representations.
Revision numbers are shorthand
Within a single repository, you can use a [:RevisionNumber:revision number] as shorthand for a changeset ID.