diff --git a/crates/oxc_syntax/src/identifier.rs b/crates/oxc_syntax/src/identifier.rs
index ba07377f9..4822e2c9c 100644
--- a/crates/oxc_syntax/src/identifier.rs
+++ b/crates/oxc_syntax/src/identifier.rs
@@ -63,26 +63,38 @@ pub fn is_line_terminator(c: char) -> bool {
     is_regular_line_terminator(c) || is_irregular_line_terminator(c)
 }
 
-const T: bool = true;
-const F: bool = false;
+const XX: bool = true;
+const __: bool = false;
 
 #[repr(C, align(64))]
 pub struct Align64<T>(pub(crate) T);
 
-// This contains `$` (36) and `_` (95)
+// `a`-`z`, `A`-`Z`, `$` (0x24), `_` (0x5F)
+#[rustfmt::skip]
 pub const ASCII_START: Align64<[bool; 128]> = Align64([
-    F, F, F, F, F, F, F, F, F, F, F, F, F, F, F, F, F, F, F, F, F, F, F, F, F, F, F, F, F, F, F, F,
-    F, F, F, F, T, F, F, F, F, F, F, F, F, F, F, F, F, F, F, F, F, F, F, F, F, F, F, F, F, F, F, F,
-    F, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, F, F, F, F, T,
-    F, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, F, F, F, F, F,
+//  0   1   2   3   4   5   6   7   8   9   A   B   C   D   E   F   //
+    __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 0
+    __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 1
+    __, __, __, __, XX, __, __, __, __, __, __, __, __, __, __, __, // 2
+    __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 3
+    __, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, // 4
+    XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, __, __, __, __, XX, // 5
+    __, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, // 6
+    XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, __, __, __, __, __, // 7
 ]);
 
-// This contains `$` (36)
+// `ASCII_START` + `0`-`9`
+#[rustfmt::skip]
 pub const ASCII_CONTINUE: Align64<[bool; 128]> = Align64([
-    F, F, F, F, F, F, F, F, F, F, F, F, F, F, F, F, F, F, F, F, F, F, F, F, F, F, F, F, F, F, F, F,
-    F, F, F, F, T, F, F, F, F, F, F, F, F, F, F, F, T, T, T, T, T, T, T, T, T, T, F, F, F, F, F, F,
-    F, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, F, F, F, F, T,
-    F, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, F, F, F, F, F,
+//  0   1   2   3   4   5   6   7   8   9   A   B   C   D   E   F   //
+    __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 0
+    __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 1
+    __, __, __, __, XX, __, __, __, __, __, __, __, __, __, __, __, // 2
+    XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, __, __, __, __, __, __, // 3
+    __, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, // 4
+    XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, __, __, __, __, XX, // 5
+    __, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, // 6
+    XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, __, __, __, __, __, // 7
 ]);
 
 #[inline]