How to do font fallback for math?

How to do font fallback for math?

[Darksair]

Hi all,

Basically I’m trying to use the Neo Euler font for math.  It’s missing
some symbols, and I would like to fallback to some other fonts.  But I’m
having trouble setting up this fallback.  For example,

  % Use lmr to type numbers?
  \definefontfallback[somefbk][name:lmroman12][0x30-0x39][force=yes]
  
  % Trying to use Neo Euler here
  \starttypescript [math] [myEuler]
    \definefontsynonym[MathRoman][name:neoeuler][features=math\mathsizesuffix, fallbacks=somefbk]
  \stoptypescript
  
  \starttypescript[Test]
    \definetypeface[Test][mm][math][myEuler][default][rscale=0.95]
  \stoptypescript
  
  \usetypescript[Test]
  \setupbodyfont[Test]
  
  \starttext
  \startformula
    \Omega = \int_0^x \sin 2x\, {\rm d}x
  \stopformula
  \stoptext
  
But in the generated PDF, the “0” and “2” are both typed in Euler.  What
should I do to get them fallback to lmr?

Thanks!

-- 
Darksair | http://darksair.org/

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