Type hinting fixes

lib/CoreFunctions.php

@@ -6,18 +6,18 @@ use function Safe\ob_end_clean;
 use function Safe\ob_start;
 
 // Convenience alias of var_dump.
-function vd($var): void{
+function vd(mixed $var): void{
 	var_dump($var);
 }
 
 // var_dump($var) then die().
-function vdd($var): void{
+function vdd(mixed $var): void{
 	var_dump($var);
 	die();
 }
 
 // var_dump into a string.
-function vds($var): string{
+function vds(mixed $var): string{
 	ob_start();
 	var_dump($var);
 	$str = ob_get_contents();