Fix a type declaration problem on 32-bit environments

In 32-bit environments, the UINT32_MAX cannot be represented by an
integer but it will become a floating point value, instead. Hence, we
need to allow parameters and return values of Util::limit to be of type
`float`.

lib/Utility/Scanner.php

@@ -681,7 +681,11 @@ private function userL10N(string $userId) : IL10N {
 		return $this->l10nFactory->get('music', $languageCode);
 	}
 
-	private static function normalizeOrdinal(/*mixed*/ $ordinal) : ?int {
+	/**
+	 * @param int|float|string|null $ordinal
+	 * @return int|float|null
+	 */
+	private static function normalizeOrdinal(/*mixed*/ $ordinal) {
 		if (\is_string($ordinal)) {
 			// convert format '1/10' to '1'
 			$ordinal = \explode('/', $ordinal)[0];
@@ -710,7 +714,11 @@ private static function parseFileName(string $fileName) : array {
 		}
 	}
 
-	private static function normalizeYear(/*mixed*/ $date) : ?int {
+	/**
+	 * @param int|float|string|null $date
+	 * @return int|float|null
+	 */
+	private static function normalizeYear(/*mixed*/ $date) {
 		$year = null;
 		$matches = null;
 
@@ -725,7 +733,11 @@ private static function normalizeYear(/*mixed*/ $date) : ?int {
 		return Util::limit($year, Util::SINT32_MIN, Util::SINT32_MAX);
 	}
 
-	private static function normalizeUnsigned(/*mixed*/ $value) : ?int {
+	/**
+	 * @param int|float|string|null $value
+	 * @return int|float|null
+	 */
+	private static function normalizeUnsigned(/*mixed*/ $value) {
 		if (\is_numeric($value)) {
 			$value = (int)\round((float)$value);
 		} else {

lib/Utility/Util.php

@@ -379,8 +379,12 @@ public static function swap(&$a, &$b) : void {
 	/**
 	 * Limit an integer value between the specified minimum and maximum.
 	 * A null value is a valid input and will produce a null output.
+	 * @param int|float|null $input
+	 * @param int|float $min
+	 * @param int|float $max
+	 * @return int|float|null
 	 */
-	public static function limit(?int $input, int $min, int $max) : ?int {
+	public static function limit($input, $min, $max) {
 		if ($input === null) {
 			return null;
 		} else {