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Details: * The option `fonts.fontconfig.ultimate.enable` can be used to disable the fontconfig-ultimate configuration. * The user-configurable options provided by fontconfig-ultimate are exposed in the NixOS module: `allowBitmaps` (default: true), `allowType1` (default: false), `useEmbeddedBitmaps` (default: false), `forceAutohint` (default: false), `renderMonoTTFAsBitmap` (default: false). * Upstream provides three substitution modes for substituting TrueType fonts for Type 1 fonts (which do not render well). The default, "free", substitutes free fonts for Type 1 fonts. The option "ms" substitutions Microsoft fonts for Type 1 fonts. The option "combi" uses a combination of Microsoft and free fonts. Substitutions can also be disabled. * All 21 of the Infinality rendering modes supported by fontconfig-ultimate or by the original Infinality distribution can be selected through `fonts.fontconfig.ultimate.rendering`. The default is the medium style provided by fontconfig-ultimate. Any of the modes may be customized, or Infinality rendering can be disabled entirely.