Fix unwrap panic in extract_number_for_key in impl TraitAccessorPrivate for CTFontTraits on macOS Ventura.

core-text/src/font_descriptor.rs

@@ -19,6 +19,7 @@ use core_foundation::url::{CFURLRef, CFURL};
 use core_foundation::{declare_TCFType, impl_CFTypeDescription, impl_TCFType};
 use core_graphics::base::CGFloat;
 
+use core_foundation::boolean::CFBoolean;
 use std::path::PathBuf;
 
 /*
@@ -144,7 +145,23 @@ trait TraitAccessorPrivate {
 impl TraitAccessorPrivate for CTFontTraits {
     fn extract_number_for_key(&self, key: CFStringRef) -> CFNumber {
         let cftype = self.get(key);
-        cftype.downcast::<CFNumber>().unwrap()
+        let number = cftype.downcast::<CFNumber>();
+        match number {
+            Some(number) => number,
+            None => {
+                // The value was not able to be converted to a CFNumber, this violates the Core
+                // Foundation's docs (see https://developer.apple.com/documentation/coretext/kctfontsymbolictrait)
+                // but can occur in practice with certain fonts in MacOS 13 (Ventura). When this
+                // does occur in Ventura, the value returned is always a CFBoolean, so we attempt to
+                // convert into a boolean and create a number from there.
+                let value_as_bool = bool::from(
+                    cftype
+                        .downcast::<CFBoolean>()
+                        .expect("Should be able to convert value into CFBoolean"),
+                );
+                CFNumber::from(value_as_bool as i32)
+            }
+        }
     }
 }