Using dsrom with MKIV

[Aditya Mahajan <adityam@umich.edu>]

Hi,

The dsrom math font only works partially with MKIV, and I do not 
understand what is happening. Consider the following example from 
http://wiki.contextgarden.net/Doublestroke (which I wrote, after 
suggestions on the mailing list). One needs the fonts, which are part of 
TL and are also available at 
http://ctan.org/tex-archive/fonts/doublestroke/

%=======================================================================
\loadmapfile[dstroke.map]

\starttypescript [math] [modern,computer-modern,latin-modern,ams] [size]
   \definebodyfont [17.3pt,14.4pt,12pt][mm]
                   [mb=dsrom12 sa 1]
   \definebodyfont [11pt,10pt,9pt] [mm]
                   [mb=dsrom10 sa 1]
   \definebodyfont [8pt,7pt,6pt,5pt,4pt] [mm]
                   [mb=dsrom8 sa 1]
\stoptypescript

\definetypeface [modern] [mm] [math] [modern] [ams] [encoding=texnansi]
\setupbodyfont[reset,modern,10pt]

\definefamilysynonym [default] [doublestroke]   [mb]

\def\dstroke {\fam\purefamily  {doublestroke}}

\def\doublestroke#1{{\dstroke#1}}

\starttext
$\doublestroke{E} \doublestroke{1}$
\stoptext
%=======================================================================


This works correctly in MKII (Both E and 1 are shown in dsrom font). 
However, in MKIV the 1 is shown in LM Roman rather than dsrom.

Is this a bug in context font handling, or a bug in the typescript?

I am using: context version: 2008.12.01 10:25
This is LuaTeX, Version snapshot-0.30.3-2008112812


Aditya


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