What does this mean?

Created attachment 53563 [details]
testing code

I'm using FcDefaultSubstitute() intentionally to add a lang from FcGetDefaultLang() to the pattern. you can see fontconfig doesn't deal with modifiers so far:

% LANG=sr@Latn ./a.out
Pattern has 16 elts (size 32)
        slant: 0(i)(s)
        weight: 100(i)(s)
        width: 100(i)(s)
        size: 12(f)(s)
        pixelsize: 12.5(f)(s)
        hintstyle: 3(i)(s)
        hinting: FcTrue(s)
        verticallayout: FcFalse(s)
        autohint: FcFalse(s)
        globaladvance: FcTrue(s)
        dpi: 75(f)(s)
        scale: 1(f)(s)
        lang: "sr"(s)
        fontversion: 2147483647(i)(s)
        embeddedbitmap: FcTrue(s)
        decorative: FcFalse(s)

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