Added BigInt

src/Globals/BigInt.php

@@ -0,0 +1,27 @@
+<?php
+
+declare(strict_types=1);
+
+final class BigInt {
+  /** @var int */
+  private $value;
+
+  /** @param string|int|BigInt|bool $value */
+  function __construct($value) {
+    if ($value instanceof BigInt) {
+      $value = $value->valueOf();
+    }
+
+    $this->value = (int) $value;
+  }
+
+  /** Returns the primitive value of the specified object. */
+  function valueOf(): int {
+    return $this->value;
+  }
+}
+
+/** @param string|int|BigInt|bool $value */
+function BigInt($value): BigInt {
+  return new BigInt($value);
+}