fix: add additional optional cf properties (#777)

Author: guybedford

worker-sys/src/types/incoming_request_cf_properties.rs

@@ -12,7 +12,7 @@ extern "C" {
     pub fn colo(this: &IncomingRequestCfProperties) -> Result<String, JsValue>;
 
     #[wasm_bindgen(method, catch, getter)]
-    pub fn asn(this: &IncomingRequestCfProperties) -> Result<u32, JsValue>;
+    pub fn asn(this: &IncomingRequestCfProperties) -> Result<Option<u32>, JsValue>;
 
     #[wasm_bindgen(method, catch, getter, js_name=asOrganization)]
     pub fn as_organization(this: &IncomingRequestCfProperties) -> Result<Option<String>, JsValue>;

worker/src/cf.rs

@@ -33,7 +33,7 @@ impl Cf {
     }
 
     /// The Autonomous System Number (ASN) of the request, e.g. `395747`
-    pub fn asn(&self) -> u32 {
+    pub fn asn(&self) -> Option<u32> {
         self.inner.asn().unwrap()
     }