[metapost] CMYK colours in SVG output

[Stephan Hennig]

Hi,

the following code uses a CMYK colour while generating SVG output.
MetaPost seems to be nice and silently convert that into an RGB colour.

outputformat := "svg";
beginfig(1);
  draw fullcircle withcmykcolor (.1,.2,.3,.4);
endfig;
end

To be honest, I'd expect MetaPost to error out on colouring objects with
colours from a colour model that isn't supported by the output format.
Isn't such use-case better be dealt with at the macro level than on the
engine level, i.e., by providing a macro that does the conversion?
Implicit conversion seems wrong to me.  Are the conversion rules
documented somewhere?  Can they be configured by the user?

Best regards,
Stephan Hennig