[XeTeX] Bug or design flaw in Polyglossia 2012/04/29 v1.2.1

[Arthur Reutenauer]

On Sat, Mar 30, 2013 at 10:18:49PM +0100, Peter Dyballa wrote:
> Exactly. But when Malayalam uses as punctuation or in calendar dates Latin script characters, why is Polyglossia using a Malayalam font to display these entities?

  Because you told it to.  You set up Malayalam to be the main language
of the document with \setmainlanguage{malayalam} and you never changed
the language in the document body, hence Polyglossia uses the font for
Malayalam.

	Arthur