[plt-scheme] Boxing in MzScheme

 From manual: "MzScheme provides boxes, which are records that have a single
field."
I wonder, why one-field record is such important so it has its own
construction? :))
Or maybe boxing has some special usage? 
I'm knowing about boxing in .NET, where it is used to wrap "simple" data
types like integers into Object.
Maybe something similar?

-- 
Sergey Khorev
http://iamphet.nm.ru
As between the skulking and furtive poacher, who hunts for the sake of meat,
and the honest gentleman shooter, who kills for the pleasure of sport, I
find
the former a higher type of humanity.
 -- Edward Abbey