Built-in Rust/Rustler type vocabulary for RustQ.Meta.defrust/2 specs.

Prefer ordinary Elixir types when they fit. RustQ.Meta maps built-ins such as atom(), term(), boolean(), integer(), float(), and binary() to Rust/Rustler types. Use ordinary remote types for external Rust paths where possible: SkiaSafe.Canvas.t() renders as skia_safe::Canvas, and GeneratedOpts.OvalOpts.t(R.lifetime(:a)) renders as generated_opts::OvalOpts<'a>. Use this module where Rust needs extra precision or syntax that Elixir types cannot express cleanly: fixed-width numbers, enum intent markers, references, lifetimes, slices, NifResult, Vec, and unit.

alias RustQ.Type, as: R

@spec draw(R.ref(SkiaSafe.Canvas.t()), R.f32(), R.f32()) :: R.nif_result(R.unit())
defrust draw(canvas, x, y) do
  canvas.translate({x, y})
  :ok
end

@spec decode_mode(atom()) :: R.nif_result(Mode.t())
defrust decode_mode(atom) do
  # atom() maps to Rustler Atom
end

The functions with matching names are marker helpers for non-typespec macro contexts and for the reserved built-in names (R.atom(), R.bool(), R.term()). They are not runtime APIs.