Loosen up strict typings (#1)

* default value for fixVersions

* cast to null

* make version nullable

* set globalId to empty string, because not every assigned link has a global id. just the links assigned from the api will have that field filled.

src/Issue/IssueField.php

@@ -50,7 +50,7 @@ class IssueField implements \JsonSerializable
 
     public ?object $resolution;
 
-    public array $fixVersions;
+    public ?array $fixVersions = null;
 
     public ?Reporter $creator;
 
@@ -60,8 +60,8 @@ class IssueField implements \JsonSerializable
 
     public ?Reporter $assignee = null;
 
-    /** @var \JiraCloud\Issue\Version[] */
-    public $versions;
+    /** @var \JiraCloud\Issue\Version[]|null */
+    public ?array $versions = null;
 
     /** @var \JiraCloud\Issue\Attachment[] */
     public $attachment;

src/Issue/RemoteIssueLink.php

@@ -25,6 +25,7 @@ public function jsonSerialize()
     public function __construct()
     {
         $this->object = new RemoteObject();
+        $this->globalId = '';
     }
 
     public function setUrl(string $url): static