removed useless type juggling

Author: dg

src/PhpGenerator/Parameter.php

@@ -59,7 +59,7 @@ public function isReference(): bool
 	 */
 	public function setTypeHint(?string $hint): self
 	{
-		$this->typeHint = $hint ? (string) $hint : null;
+		$this->typeHint = $hint;
 		return $this;
 	}
 

src/PhpGenerator/Traits/CommentAware.php

@@ -24,7 +24,7 @@ trait CommentAware
 	 */
 	public function setComment(?string $val): self
 	{
-		$this->comment = $val ? (string) $val : null;
+		$this->comment = $val;
 		return $this;
 	}
 

src/PhpGenerator/Traits/FunctionLike.php

@@ -128,7 +128,7 @@ public function isVariadic(): bool
 	 */
 	public function setReturnType(?string $val): self
 	{
-		$this->returnType = $val ? (string) $val : null;
+		$this->returnType = $val;
 		return $this;
 	}