This changes nothing, don't look

src/Faker/UniqueGenerator.php

@@ -0,0 +1,70 @@
+<?php
+
+namespace Siteworx\Faker;
+
+/**
+ * Proxy for other generators, to return only unique values. Works with
+ * Faker\Generator\Base->unique()
+ */
+class UniqueGenerator
+{
+
+    protected Generator $generator;
+
+    protected int $maxRetries;
+
+    protected array $uniques = [];
+
+    /**
+     * @param Generator $generator
+     * @param integer $maxRetries
+     */
+    public function __construct(Generator $generator, int $maxRetries = 10000)
+    {
+        $this->generator = $generator;
+        $this->maxRetries = $maxRetries;
+    }
+
+    /**
+     * Catch and proxy all generator calls but return only unique values
+     * @param string $attribute
+     * @return mixed
+     */
+    public function __get(string $attribute)
+    {
+        return $this->__call($attribute, array());
+    }
+
+    public function __isset($name)
+    {
+    }
+
+    public function __set(string $key, $value)
+    {
+        throw new \RuntimeException('Faker is immutable');
+    }
+
+    /**
+     * Catch and proxy all generator calls with arguments but return only unique values
+     * @param string $name
+     * @param array $arguments
+     * @return mixed
+     */
+    public function __call(string $name, array $arguments)
+    {
+        if (!isset($this->uniques[$name])) {
+            $this->uniques[$name] = array();
+        }
+        $i = 0;
+        do {
+            $res = call_user_func_array(array($this->generator, $name), $arguments);
+            $i++;
+            if ($i > $this->maxRetries) {
+                throw new \OverflowException(sprintf('Maximum retries of %d reached without finding a unique value', $this->maxRetries));
+            }
+        } while (array_key_exists(serialize($res), $this->uniques[$name]));
+        $this->uniques[$name][serialize($res)] = null;
+
+        return $res;
+    }
+}