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/// Shaper that uses CoreText.
///
/// CoreText shaping differs in subtle ways from HarfBuzz so it may result
/// in inconsistent rendering across platforms. But it also fixes many
/// issues (some macOS specific):
///
///   - Theta hat offset is incorrect in HarfBuzz but correct by default
///     on macOS applications using CoreText. (See:
///     https://github.com/harfbuzz/harfbuzz/discussions/4525)
///
///   - Hyphens (U+2010) can be synthesized by CoreText but not by HarfBuzz.
///     See: https://github.com/mitchellh/ghostty/issues/1643
///
pub const Shaper = struct {
    /// The allocated used for the feature list, font cache, and cell buf.
    alloc: Allocator,

    /// The string used for shaping the current run.
    run_state: RunState,

    /// CoreFoundation Dictionary which represents our font feature settings.
    features: *macos.foundation.Dictionary,
// ...