Fix type assignment errors in element construction

src/Elements/AbstractElement.php

@@ -90,12 +90,16 @@
 		'dir' => 'auto',
 	];
 
+	/**
+	 * @param array<string, string>|null $attributes
+	 * @param array<int, \MadeByDenis\PhpMjmlRenderer\Node>|null $childNodes
+	 */
 	public function __construct(?array $attributes = [], string $content = '', ?array $childNodes = [])
 	{
 		$this->attributes = $this->formatAttributes(
 			$this->defaultAttributes,
 			$this->allowedAttributes,
-			$attributes,
+			$attributes ?? [],
 		);
 
 		$this->content = $content;
@@ -104,12 +108,12 @@
 
 	public function isEndingTag(): bool
 	{
 		return static::ENDING_TAG;
 	}
 
 	public function getTagName(): string
 	{
 		return static::TAG_NAME;
 	}
 
 	public function isRawElement(): bool
@@ -181,7 +185,7 @@
 
 	// To-do: Override the globally set attributes if we override some from the CLI or some options.
 
 	protected function getChildren(): ?array
 	{
 		return $this->children;
 	}
@@ -231,9 +235,9 @@
 		return trim($attrOut);
 	}
 
 	abstract public function getStyles(): array;
 
 	protected function styles($styles): string
 	{
 		$stylesArray = [];
 
@@ -247,20 +251,20 @@
 
 		$styles = '';
 
 		array_walk($stylesArray, function ($val, $key) use (&$styles) {
 			if (!empty($val)) {
 				if (is_array($val)) {
 					$val = implode(' ', $val);
 				}
 
 				$styles .= "$key:$val;";
 			}
 		});
 
 		return trim($styles);
 	}
 
 	protected function getShorthandAttrValue($attribute, $direction): int
 	{
 		$mjAttributeDirection = $this->getAttribute("$attribute-$direction");
 		$mjAttribute = $this->getAttribute($attribute);
@@ -351,10 +355,16 @@
 		];
 	}
 
+	/**
+	 * @param array<string, string> $defaultAttributes
+	 * @param array<string, array<string, string>> $allowedAttributes
+	 * @param array<string, string> $passedAttributes
+	 * @return array<string, string>
+	 */
 	private function formatAttributes(
 		array $defaultAttributes,
 		array $allowedAttributes,
-		?array $passedAttributes = []
+		array $passedAttributes = []
 	): array {
 		/*
 		 * Check if the attributes are of the proper format based on the allowed attributes.