update some coments and param type

Author: inhere

src/Helper/PhpHelper.php

@@ -116,7 +116,7 @@ public static function newMemoryStream(string $mode = 'rwb')
      * get $_SERVER value
      *
      * @param string $name
-     * @param string $default
+     * @param string|mixed $default
      *
      * @return mixed
      */
@@ -192,7 +192,7 @@ public static function initObject($object, array $options)
      *
      * @return array
      */
-    public static function runtime($startTime, $startMem, array $info = [], $realUsage = false): array
+    public static function runtime(int $startTime, $startMem, array $info = [], bool $realUsage = false): array
     {
         $info['startTime'] = $startTime;
         $info['endTime']   = microtime(true);
@@ -202,8 +202,8 @@ public static function runtime($startTime, $startMem, array $info = [], $realUsa
         $info['runtime'] = number_format(($info['endTime'] - $startTime) * 1000, 3) . 'ms';
 
         if ($startMem) {
-            $startMem = array_sum(explode(' ', $startMem));
-            $endMem   = array_sum(explode(' ', $info['endMemory']));
+            $startMem = array_sum(explode(' ', (string)$startMem));
+            $endMem   = array_sum(explode(' ', (string)$info['endMemory']));
 
             $info['memory'] = number_format(($endMem - $startMem) / 1024, 3) . 'kb';
         }

src/Math.php

@@ -54,7 +54,7 @@ public static function abs($value): int
      */
     public static function round($value, int $precision = 0, int $mode = PHP_ROUND_HALF_UP): float
     {
-        return (float)round((float)$value, $precision, $mode);
+        return round((float)$value, $precision, $mode);
     }
 
     /**

src/OS.php

@@ -274,7 +274,7 @@ public static function getNullDevice(): string
      *
      * @return boolean
      */
-    public static function isInteractive(int $fileDescriptor): bool
+    public static function isInteractive($fileDescriptor): bool
     {
         return function_exists('posix_isatty') && @posix_isatty($fileDescriptor);
     }

src/Type.php

@@ -21,17 +21,15 @@ final class Type
 {
     // ------ basic types ------
 
-    // TIPS: not in gettype returns.
-    public const INT = 'int';
+    public const INT = 'int'; // TIPS: not in gettype returns.
 
     public const INTEGER = 'integer';
 
     public const FLOAT = 'float';
 
     public const DOUBLE = 'double';
 
-    // TIPS: not in gettype returns.
-    public const BOOL = 'bool';
+    public const BOOL = 'bool'; // TIPS: not in gettype returns.
 
     public const BOOLEAN = 'boolean';
 
@@ -49,10 +47,12 @@ final class Type
 
     // ------ other type names ------
 
-    public const CALLABLE = 'callable';
+    public const NULL = 'null';
 
     public const MiXED = 'mixed';
 
+    public const CALLABLE = 'callable';
+
     public const UNKNOWN = 'unknown type';
 
     /**