expected behavior of "%unset" in configuration file

[FUJIWARA Katsunori]

Hi, devels.

"hg help config" says:

    A line with ``%unset name`` will remove ``name`` from the current
    section, if it has been set previously.

In this description, it is not explicitly described whether "%unset"
can remove the value which "has benn set" in another configuration
file read "previously" or not.

And current "ui"/"config" implementation doesn't remove such value.
"%unset" can remove only values set in same configuration file.

Is current behavior expected one ?

If current behavior is expected one, should it be described
explicitly, to prevent users from misunderstanding ? at least, I
misunderstood and confirmed with source code of Mercurial :-)

Or can native speakers read such meaning from above description ? If
so, I'll add translation note to translated version of "hg help
config" instead of adding explanation to original help text.

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[FUJIWARA Katsunori]                             foozy at lares.dti.ne.jp