Update UnicodeExtensionComponents

Support both '-u-' and 'u-' extension patterns.

boa_engine/src/builtins/intl/mod.rs

@@ -313,7 +313,10 @@ fn unicode_extension_components(extension: &JsString) -> UniExtRecord {
     let size = extension.len();
 
     // 5. Let k be 3.
-    let mut k = 3;
+    //
+    // Actually, it has to be 3 when the extension begins with dash (-u-ca-gregory).
+    // When the extension begins with u (u-ca-gregory), start with 2.
+    let mut k = if extension.starts_with("u-") { 2 } else { 3 };
 
     // 6. Repeat, while k < size,
     while k < size {

boa_engine/src/builtins/intl/tests.rs

@@ -163,6 +163,13 @@ fn uni_ext_comp() {
     assert_eq!(components.keywords.len(), 1);
     assert_eq!(components.keywords[0].key, "ca");
     assert_eq!(components.keywords[0].value, "islamic-civil");
+
+    let ext = JsString::new("u-ca-islamic-civil");
+    let components = unicode_extension_components(&ext);
+    assert!(components.attributes.is_empty());
+    assert_eq!(components.keywords.len(), 1);
+    assert_eq!(components.keywords[0].key, "ca");
+    assert_eq!(components.keywords[0].value, "islamic-civil");
 }
 
 #[test]

boa_engine/src/object/mod.rs

@@ -1155,6 +1155,7 @@ impl Object {
         }
     }
 
+    #[cfg(feature = "intl")]
     #[inline]
     pub fn as_date_time_format_mut(&mut self) -> Option<&mut DateTimeFormat> {
         match self.data {