removed useless type juggling

Author: dg

src/Mail/Message.php

@@ -174,7 +174,7 @@ public function getReturnPath(): string
 	 */
 	public function setPriority(int $priority)
 	{
-		$this->setHeader('X-Priority', (int) $priority);
+		$this->setHeader('X-Priority', $priority);
 		return $this;
 	}
 
@@ -194,8 +194,6 @@ public function getPriority(): int
 	 */
 	public function setHtmlBody(string $html, string $basePath = NULL)
 	{
-		$html = (string) $html;
-
 		if ($basePath) {
 			$cids = [];
 			$matches = Strings::matchAll(
@@ -298,8 +296,6 @@ private function createAttachment(string $file, string $content = NULL, string $
 			if ($content === FALSE) {
 				throw new Nette\FileNotFoundException("Unable to read file '$file'.");
 			}
-		} else {
-			$content = (string) $content;
 		}
 		$part->setBody($content);
 		$part->setContentType($contentType ? $contentType : finfo_buffer(finfo_open(FILEINFO_MIME_TYPE), $content));

src/Mail/MimePart.php

@@ -194,7 +194,7 @@ public function addPart(MimePart $part = NULL): self
 	 */
 	public function setBody(string $body)
 	{
-		$this->body = (string) $body;
+		$this->body = $body;
 		return $this;
 	}
 

src/Mail/SendmailMailer.php

@@ -42,7 +42,7 @@ public function send(Message $mail): void
 			str_replace(Message::EOL, PHP_EOL, $parts[0]),
 		];
 		if ($this->commandArgs) {
-			$args[] = (string) $this->commandArgs;
+			$args[] = $this->commandArgs;
 		}
 		$res = Nette\Utils\Callback::invokeSafe('mail', $args, function ($message) use (&$info) {
 			$info = ": $message";