Fix millia

Use special millions prefix only when millia is less than one.

packages/core/src/systems/en-US/short-count/stringify.ts

@@ -79,11 +79,11 @@ const makeHundredsName = (hundreds: number, tens: number, ones: number, addTensD
 /**
  * Builds a name for numbers in the millions.
  * @param millions - Millions digit.
- * @param milliaCount - Number of millia- groups.
+ * @param longestMilliaCount - Number of millia- groups.
  * @returns string The millions prefix.
  */
-const makeMillionsPrefix = (millions: number, milliaCount: GroupPlace) => {
-	if (milliaCount > 0) {
+const makeMillionsPrefix = (millions: number, longestMilliaCount: GroupPlace) => {
+	if (longestMilliaCount > 0) {
 		return MILLIONS_PREFIXES[millions] as MillionsPrefix;
 	}
 
@@ -94,12 +94,16 @@ const makeMillionsPrefix = (millions: number, milliaCount: GroupPlace) => {
  * Builds a name for numbers in the decillions.
  * @param decillions - Decillions digit.
  * @param millions - Millions digit.
- * @param milliaCount - Number of millia- groups.
+ * @param longestMilliaCount - Number of millia- groups.
  * @returns string The decillions prefix.
  */
-const makeDecillionsPrefix = (decillions: number, millions: number, milliaCount: GroupPlace) => {
+const makeDecillionsPrefix = (
+	decillions: number,
+	millions: number,
+	longestMilliaCount: GroupPlace,
+) => {
 	if (decillions === 0) {
-		return makeMillionsPrefix(millions, milliaCount);
+		return makeMillionsPrefix(millions, longestMilliaCount);
 	}
 
 	const onesPrefix = MILLIONS_PREFIXES[millions] as MillionsPrefix;
@@ -112,17 +116,17 @@ const makeDecillionsPrefix = (decillions: number, millions: number, milliaCount:
  * @param centillions - Centillions digit.
  * @param decillions - Decillions digit.
  * @param millions - Millions digit.
- * @param milliaCount - Number of millia- groups.
+ * @param longestMilliaCount - Number of millia- groups.
  * @returns string The centillions prefix.
  */
 const makeCentillionsPrefix = (
 	centillions: number,
 	decillions: number,
 	millions: number,
-	milliaCount: GroupPlace,
+	longestMilliaCount: GroupPlace,
 ) => {
 	if (centillions === 0) {
-		return makeDecillionsPrefix(decillions, millions, milliaCount);
+		return makeDecillionsPrefix(decillions, millions, longestMilliaCount);
 	}
 
 	const onesPrefix = MILLIONS_PREFIXES[millions] as MillionsPrefix;
@@ -177,10 +181,10 @@ const getGroupName = (place: GroupPlace, shortenMillia: boolean) => {
 		)
 		.map(([groupDigits, groupPlace]) => [groupDigits.padStart(3, '0'), groupPlace] as const)
 		.filter(([groupDigits]) => groupDigits !== EMPTY_GROUP_DIGITS)
-		.map(([groupDigits, groupPlace]) => {
+		.map(([groupDigits, groupPlace], _index, millias) => {
 			const [hundreds, tens, ones] = groupDigits.split('').map(Number);
 			if (groupPlace < 1) {
-				return makeCentillionsPrefix(hundreds, tens, ones, groupPlace);
+				return makeCentillionsPrefix(hundreds, tens, ones, BigInt(millias.length - 1));
 			}
 
 			const milliaSuffix = (
@@ -193,7 +197,7 @@ const getGroupName = (place: GroupPlace, shortenMillia: boolean) => {
 				return milliaSuffix;
 			}
 
-			return makeCentillionsPrefix(hundreds, tens, ones, groupPlace) + milliaSuffix;
+			return makeCentillionsPrefix(hundreds, tens, ones, BigInt(millias.length - 1)) + milliaSuffix;
 		})
 		.join('');
 

packages/core/test/systems/en-US.test.ts

@@ -282,5 +282,8 @@ describe('numerica', () => {
 		const exp4 = numberToExponential(value4);
 		expect(stringify(value4)).toBe('twelve thousand twenty');
 		expect(parse(stringify(value4))).toBe(exp4);
+
+		const value5 = '1e3006';
+		expect(stringify(value5)).toBe('one milliauntillion');
 	});
 });