lib/packages: Fix implicit nullable types

In EntityChangeFactory::newFromUpdate(), I initially wanted to make both
EntityDocument arguments required, but Phan and the tests showed that
WikiPageActionEntityChangeFactory::newForPageDeleted() actually calls it
without the last argument, so let’s leave the last default argument in
place. (Making both EntityDocument arguments optional doesn’t really
make sense because at least one has to be non-null according to the
condition immediately below the method signature – although I could also
be convinced that having only one of the parameters optional is weird
and inconsistent and it would be nicer to make them both optional after
all, if anyone feels that way.)

Bug: T379509
Change-Id: I7840b2c1af4424effbb774b42c02813c73f113a7

src/Entity/Item.php

@@ -60,17 +60,12 @@ class Item implements
 
 	/**
 	 * @since 1.0
-	 *
-	 * @param ItemId|null $id
-	 * @param Fingerprint|null $fingerprint
-	 * @param SiteLinkList|null $siteLinks
-	 * @param StatementList|null $statements
 	 */
 	public function __construct(
-		ItemId $id = null,
-		Fingerprint $fingerprint = null,
-		SiteLinkList $siteLinks = null,
-		StatementList $statements = null
+		?ItemId $id = null,
+		?Fingerprint $fingerprint = null,
+		?SiteLinkList $siteLinks = null,
+		?StatementList $statements = null
 	) {
 		$this->id = $id;
 		$this->fingerprint = $fingerprint ?: new Fingerprint();

src/Entity/Property.php

@@ -68,7 +68,7 @@ public function __construct(
 		?PropertyId $id,
 		?Fingerprint $fingerprint,
 		$dataTypeId,
-		StatementList $statements = null
+		?StatementList $statements = null
 	) {
 		$this->id = $id;
 		$this->fingerprint = $fingerprint ?: new Fingerprint();

src/Statement/Statement.php

@@ -59,17 +59,12 @@ class Statement implements PropertyIdProvider {
 
 	/**
 	 * @since 2.0
-	 *
-	 * @param Snak $mainSnak
-	 * @param SnakList|null $qualifiers
-	 * @param ReferenceList|null $references
-	 * @param string|null $guid
 	 */
 	public function __construct(
 		Snak $mainSnak,
-		SnakList $qualifiers = null,
-		ReferenceList $references = null,
-		string $guid = null
+		?SnakList $qualifiers = null,
+		?ReferenceList $references = null,
+		?string $guid = null
 	) {
 		$this->mainSnak = $mainSnak;
 		$this->qualifiers = $qualifiers ?: new SnakList();

src/Statement/StatementGuid.php

@@ -32,7 +32,7 @@ class StatementGuid {
 	 * @param string|null $originalStatementId the original, non-normalized, statement id.
 	 * Defaults to `null` for compatability.
 	 */
-	public function __construct( EntityId $entityId, string $guidPart, string $originalStatementId = null ) {
+	public function __construct( EntityId $entityId, string $guidPart, ?string $originalStatementId = null ) {
 		$constructedStatementId = $entityId->getSerialization() . self::SEPARATOR . $guidPart;
 		if ( $originalStatementId !== null
 			 && strtolower( $originalStatementId ) !== strtolower( $constructedStatementId ) ) {

src/Statement/StatementList.php

@@ -70,7 +70,7 @@ public function getPropertyIds(): array {
 	 *
 	 * @throws InvalidArgumentException
 	 */
-	public function addStatement( Statement $statement, int $index = null ): void {
+	public function addStatement( Statement $statement, ?int $index = null ): void {
 		if ( $index === null ) {
 			$this->statements[] = $statement;
 		} elseif ( $index >= 0 ) {
@@ -87,7 +87,7 @@ public function addStatement( Statement $statement, int $index = null ): void {
 	 * @param string|null $guid
 	 */
 	public function addNewStatement(
-		Snak $mainSnak, $qualifiers = null, $references = null, string $guid = null
+		Snak $mainSnak, $qualifiers = null, $references = null, ?string $guid = null
 	): void {
 		$qualifiers = is_array( $qualifiers ) ? new SnakList( $qualifiers ) : $qualifiers;
 		$references = is_array( $references ) ? new ReferenceList( $references ) : $references;

src/Term/Fingerprint.php

@@ -42,15 +42,10 @@ public static function newEmpty() {
 	 */
 	private $aliasGroups;
 
-	/**
-	 * @param TermList|null $labels
-	 * @param TermList|null $descriptions
-	 * @param AliasGroupList|null $aliasGroups
-	 */
 	public function __construct(
-		TermList $labels = null,
-		TermList $descriptions = null,
-		AliasGroupList $aliasGroups = null
+		?TermList $labels = null,
+		?TermList $descriptions = null,
+		?AliasGroupList $aliasGroups = null
 	) {
 		$this->labels = $labels ?: new TermList();
 		$this->descriptions = $descriptions ?: new TermList();