Khaled Hosny wrote:

I think is is arabtype's problem if they suggest turning calt off by
default, if I've contextual alternatives in my font this means I think
those alternatives are necessary to render text correctly, otherwise I
would have used a stylistic set.

it's not arabtype that suggests it, thats the problem; open type fonts *don't* have any information about what features should be on by default; it's the renderers that kind of decide it and there is no standard, so any renderer will follow its own rules

also, some features (like frac) are often implemented only partial and as such can only be applied very selectively

so, the only way out is something:

defaults{'arabtype'] = {
  arab = {
    dflt = { calt=true, mkmk=true, ...},
  },
}

a kind of database

Hans

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