独自の回答を見つけたようです (コメントの代わりに回答として入力してから選択する必要があります。これは許可されているだけでなく、ここでは推奨されています)。参考までに、その情報が存在する場所を次に示します。
$ hg help revisions
Specifying Single Revisions
Mercurial supports several ways to specify individual revisions.
A plain integer is treated as a revision number. Negative integers are
treated as sequential offsets from the tip, with -1 denoting the tip, -2
denoting the revision prior to the tip, and so forth.
A 40-digit hexadecimal string is treated as a unique revision identifier.
A hexadecimal string less than 40 characters long is treated as a unique
revision identifier and is referred to as a short-form identifier. A
short-form identifier is only valid if it is the prefix of exactly one
full-length identifier.
Any other string is treated as a bookmark, tag, or branch name. A bookmark
is a movable pointer to a revision. A tag is a permanent name associated
with a revision. A branch name denotes the tipmost revision of that
branch. Bookmark, tag, and branch names must not contain the ":"
character.
The reserved name "tip" always identifies the most recent revision.
The reserved name "null" indicates the null revision. This is the revision
of an empty repository, and the parent of revision 0.
The reserved name "." indicates the working directory parent. If no
working directory is checked out, it is equivalent to null. If an
uncommitted merge is in progress, "." is the revision of the first parent.
したがって、最初の解釈はリビジョン番号としてのものであり、それが何にも一致しなかった場合、リビジョン ID のプレフィックスとして試行されました。理論的には、1
変更セットがリビジョンのみ0
で、そのハッシュが1
.