Merge PR #2410: fix(tts-text): a currency amount past the digit cap is read digit by digit

crates/tts-text/src/normalize.rs

@@ -372,11 +372,12 @@ fn parse_amount(rest: &str, _lang: Lang) -> Option<(u64, usize, usize, u32, bool
                 if frac_digits.len() < 9 {
                     frac_digits.push(ch);
                 }
-            } else if int_digits.len() > MAX_CARDINAL_DIGITS {
-                break;
-            } else {
+            } else if int_digits.len() <= MAX_CARDINAL_DIGITS {
                 int_digits.push(ch);
             }
+            // Past the cap the digit is not collected, but the run is still consumed: `used`
+            // must cover all of it, or the caller reads only the collected digits and speaks
+            // the rest of the amount as a separate number.
             used = i + 1;
         } else if ch == ',' && !int_digits.is_empty() && !after_decimal {
             if !grouping_followed_by_3(rest, i) {

crates/tts-text/src/normalize/tests.rs

@@ -556,3 +556,17 @@ fn year_rule_survives_punctuation() {
     assert_eq!(words("(1999)", Lang::EnUs), "( nineteen ninety-nine )");
     assert_eq!(words("in 1999.", Lang::EnGb), "in nineteen ninety-nine |");
 }
+
+/// A currency amount whose digit run passes the cap must still be read digit by digit:
+/// the run is consumed as a whole, not only up to the cap. The leftover used to be spoken
+/// as a cardinal, so a `$` followed by 25 digits ended in "four hundred fifty-six billion".
+#[test]
+fn money_run_past_the_cap_is_read_digit_by_digit() {
+    assert_eq!(words("$123456789012345", Lang::EnUs), "one two three four five six seven eight nine zero one two three four five");
+    assert_eq!(
+        words("$1234567890123456789012345", Lang::EnUs),
+        "one two three four five six seven eight nine zero one two three four five six seven eight nine zero one two three four five"
+    );
+    // At or below the cap nothing changes: an amount still goes through the amount path.
+    assert_eq!(words("$12.50", Lang::EnUs), "twelve dollars and fifty cents");
+}