Constant NOTO_SANS_FALLBACKS 

const NOTO_SANS_FALLBACKS: &[EmbeddedFontId];

Per-glyph fallback chain for FontFamily::noto_sans. Math codepoints (≤ ≥ √ ∂ ∑ ∆ ◊ …) outside Noto Sans’s coverage route through Noto Sans Math via the cluster-granular retry in crate::shape_with_fallback.